Instruct: Given a question, retrieve passages that answer the question.
Query: What is the longest fork in the American River?
The North Fork is the longest tributary of the American River, at . It begins at an elevation of about near Lake Tahoe in Placer County at Mountain Meadow Lake, just northeast of Granite Chief and immediately due west of Squaw Valley Ski Resort. It flows westward through remote wilderness areas.
The Concho River has three primary feeds: the North, Middle, and South Concho Rivers. The North Concho River is the longest fork, starting in Howard County and traveling southeast for until merging with the South and Middle forks near Goodfellow Air Force Base in San Angelo, Texas. The combined branches of the river flow east about until it eventually empties into the Colorado River within the waters of the O.H. Ivie Lake about east of Paint Rock, Texas.
Nine rivers in this list cross international boundaries or form them. Four—the Yukon, Columbia, Porcupine, and Kootenay—begin in Canada and flow into the United States. Five—the Milk, Pend d'Oreille, Saint Lawrence, Red, and Saint John—begin in the United States and flow into Canada. Of these, the Milk and the Kootenay cross the international border twice, the Milk leaving and then re-entering the United States, the Kootenay leaving and then re-entering Canada. The drainage basins of these nine rivers extend into both countries; in addition, the drainage basins of six others—the Fraser, Assiniboine, South Saskatchewan, Saskatchewan, Nelson, and Winnipeg—extend into the United States even though their main stems flow entirely within Canada.
The cave consists of Chert (known as the Lost River Chert), which is overlaid by the Ste. Genevieve Limestone and St. Louis Limestone, both of which were laid down in the middle to late Mississippian Period. The river appears above ground in three short sections before flowing into the mouth of the cave. The most interesting section is the blue hole, which is the cause of the Lost River being listed by Ripley's Believe it or Not as the "Shortest, deepest river in the world." Plumb bobs indicated that the blue hole was 437 feet deep, while the river itself is only 400 feet long. In fact, the blue hole is only 16 feet deep, but is linked to a further underground river. This caused plumb bobs to be swept underground, returning erroneous measurements.
Silver Cord Cascade is a horsetail type waterfall on Surface Creek, a tributary of the Yellowstone River in Yellowstone National Park. Surface Creek flows out of Ribbon Lake off the South rim of the Grand Canyon of the Yellowstone and plunges to the Yellowstone River. It is considered the tallest waterfall in Yellowstone.
The river has Oregon's longest covered bridge crossing it at Westfir, the Office Bridge. Portions of the river were designated wild and scenic in 1988. The portion from Waldo Lake to upstream from Westfir is designated "scenic" by the State of Oregon and is known for its native trout by fly fishermen.
"Numerous artifacts and 750 pieces of timber were recovered. After extensive preservation treatment, approximately 5 percent of total lock structure is included in an Indiana State Museum Exhibit. Wabash and Erie Canal, America's longest at approximately 460 miles, linked Lake Erie at Toledo, Ohio with Ohio River at Evansville 1853."
Below Rio Vista, the lower Sacramento River is rejoined by the Deep Water Ship Channel and the Yolo Bypass and curves southwest along the base of the Montezuma Hills, forming the border of Solano and Sacramento Counties. This part of the river is dredged for navigation by large oceangoing vessels and averages three-quarters of a mile (1.2 km) across. North of Antioch and Pittsburg, the Sacramento and San Joaquin Rivers join at the head of Suisun Bay, marking the official end of both rivers. The combined waters flow west through Suisun Bay and the Carquinez Strait into San Pablo Bay and San Francisco Bay, joining the Pacific at the Golden Gate.
Group C
Union Falls ht. is a waterfall on Mountain Ash Creek, a tributary of the Fall River in the "Cascade Corner" (southwest) of Yellowstone National Park. It is the second highest waterfall in Yellowstone exceeded in height only by the lower Yellowstone Falls. The falls got its name from members of the Arnold Hague Geological Surveys sometime between 1884-86. Geologist J.P. Iddings claims the name derives from the fact that a tributary of Mountain Ash Creek joins at the very brink of the falls, thus "Union Falls". Access to the falls is via the Mountain Ash Creek trail and the Grassy Lake Road.
In 1818, the Quapaw tribe ceded all its land north of the Canadian to the United States, thus making this river the effective southern boundary of the new nation. In 1825, the Osage ceded their claims to land along the river. The Canadian was designated as the boundary between the Creek-Seminole lands on the north side and the Choctaw (and later the Chickasaw) on the south side. Major Stephen H. Long led an expedition up the Canadian River in 1821. He proclaimed the land along the river as the "Great American Desert." Despite this assessment, trading posts were established along the river, starting with Edwards' Post at the mouth of Little River. Camp Holmes was established by Colonel Henry Dodge's Dragoons in 1834. Captain Nathan Boone led a dragoon troop up the river to the 100th Meridian, which was then the western border of the United States.
In its course the Omo-Bottego has a total fall of about 700 m from the confluence of the Gibe and Wabe rivers at 1060 m to 360 m at lake-level, and is consequently a rapid stream in its upper reaches, being broken by the Kokobi and other falls, and navigable only for a short distance above where it empties into Lake Turkana, one of the lakes of the Gregory Rift. The "Spectrum Guide to Ethiopia" describes it as a popular site for white-water rafting in September and October, when the river is still high from the rainy season. Its most important tributary is the Gibe River; smaller tributaries include the Wabi, Denchya, Gojeb, Mui and Usno rivers.
The Bureau of Land Management, which administers much of the grazing land in the Antelope Reservoir basin, maintains a public campground and boat ramp at the lake. Anglers can fish for stocked trout, and wild Columbia River redband trout from Jordan Creek sometimes enter the reservoir. However, the Oregon Health Authority has issued warnings about very high levels of methylmercury contamination that makes fish caught from the lake dangerous to eat. The contamination stems from past mining activity along the headwaters of Jordan Creek, near Silver City, Idaho, where large quantities of mercury were used to separate gold and silver from other materials.
Historically, the American River, like many other rivers in California, were modified by the dams of beavers, until European trappers removed many of the beavers from their native habitat for their fur. Since the California Gold Rush was centered in an area that included the American River basin, it was one of the earlier California rivers to be populated, beginning at Leidesdorff Ranch, owned by William Leidesdorff. Water was used to drive grist mills. Gold miners dredged the riverbed and constructed diversion dams for hydraulic mining. Mining activity caused sediment and mercury waste to accumulate in the rivers. The Natoma Company completed its Folsom Powerhouse in 1895 and began delivering power 22 miles (35 km) away to the city of Sacramento to power a streetcar system.
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris are believed to have come from the park area itself as the central part of Yellowstone is the massive caldera of a supervolcano. The park contains 290 waterfalls of at least , the highest being the Lower Falls of the Yellowstone River at .
The Columbia drains an area of about . Its drainage basin covers nearly all of Idaho, large portions of British Columbia, Oregon, and Washington, ultimately all of Montana west of the Continental Divide, and small portions of Wyoming, Utah, and Nevada; the total area is similar to the size of France. Roughly of the river's length and 85 percent of its drainage basin are in the US. The Columbia is the twelfth-longest river and has the sixth-largest drainage basin in the United States. In Canada, where the Columbia flows for and drains , the river ranks 23rd in length, and the Canadian part of its basin ranks 13th in size among Canadian basins. 
The Columbia shares its name with nearby places, such as British Columbia, as well as with landforms and bodies of water.
The Rocky Face Fault is a geological fault responsible, in part, for the location of Cumberland Gap at Cumberland Mountain and the Narrows gap at Pine Mountain in the southern Appalachian mountain range. The fact that these two gaps lined up enabled western migration across the Appalachians to Kentucky. Included along the fault are the towns of Middlesboro and Pineville, Kentucky. The fault represents a crack in the Cumberland Overthrust Sheet, one of many remnant resistant strata pushed upwards to the northwest over the neighboring Cumberland Plateau. The fault is named after Rocky Face, a prominent, cliff-lined mountain between Middlesboro and Pineville, Kentucky.
In its upper course it runs for along the Finnish–Norwegian border, between the municipalities of Utsjoki, Finland and Karasjok and Tana, Norway. The river is the fifth longest in Norway. The last of the river run through the municipality of Tana in Norway. The river discharges into the Tanafjorden, one of the largest and most unspoiled river deltas in Europe. The delta is protected and is an important home to wetland birds. There are large deposits of sand in the delta that are exposed sandbars at low tide.
The river runs behind Lodge Park, a National Trust property, and through Larkethill Wood, where it flows under another lane, before passing Kilkenny Farm.
The Leach valley shows as a substantial dip in the B4425 Cirencester-Burford road. The river has an embankment at the bottom of the valley, but has not increased in size. Through all this section the river is often nearly invisible under summer vegetation. It then passes Swyre Farm with another road crossing, then Dean Farm, before reaching a very picturesque winding valley, crossed by the Westwell-Hatherop road. This section is notably a bourn in an unremarkable depression, which normally runs in the winter, but often disappears in the summer. (In recent dry winters - writing at summer 2007 - this section remained dry. Even more unusually, as of July 2007, it was running which has not happened during the summer for many years. The bourn section had been running continuously for long enough to have taken on the appearance of a river, with a scoured bed and water plants.)
Route 101 starts at U.S. Route 44 as Mashamoquet Road then Killingly Road in the town of Pomfret. It runs along the Mashamoquet Brook State Park before intersecting with Route 169. It proceeds eastward, soon passing over the Quinebaug River into the town of Killingly. East of the river, the road becomes known as Hartford Pike. Route 101 then intersects Interstate 395 and Route 12, then passes near Chase Pond, a small pond related to the Chase Reservoir. Route 101 then passes between two large lakes; on the north, the Middle Reservoir (also known as the Chestnut Hill Reservoir), and on the south, the Bog Meadow Pond. It passes by more reservoirs, as it reaches its end at the Connecticut Rhode Island border. Route 101 continues in Rhode Island as Rhode Island Route 101.
Its course is generally to the south, however with a major bend to the west at about 7° N 37° 30' E to about 36° E where it turns south until 5° 30' N where it makes a large S- bend then resumes its southerly course to Lake Turkana. According to materials published by the Ethiopian Central Statistical Agency, the Omo-Bottego River is 760 kilometers long.
In January 2008, the Guinness Book of World Records recognized The Forks as the home of the longest skating rink in the world. The 8.54-kilometre-long Assiniboine Credit Union River Trail on the Assiniboine River and the Red River is almost 1 kilometer longer than the previous record-holding rink. The 7.8-kilometre long rink on the Rideau Canal in Ottawa, Ontario had lost its World Record title which it had held since 1971. Then in 2008 the rivers beat their own record which made the longest rink go to about 9.3-kilometres. The Rideau Canal still held the record for the "world's largest naturally frozen ice rink" by the Guinness Book of World Records because "its entire length receives daily maintenance such as sweeping, ice thickness checks and there are toilet and recreational facilities along its entire length". In 2013 the Assiniboine Credit Union River Trail lost its record to the Lake Windermere Whiteway at Invermere, British Columbia, Canada.
The headwaters of the Rio Ruidoso are located near the top of Sierra Blanca Peak, in the rugged Sierra Blanca mountains, which is located within the Mescalero Apache Indian Reservation. The upper reaches of the river are divided into three forks, the longest of which is the North Fork of the Rio Ruidoso. It begins on the north side of Sierra Blanca at Ice Spring near the Ski Apache ski area. The south and middle forks begin on the south side of the mountain. They merge in Cow Canyon approximately west of the point at which the south fork merges with the north fork. From there, the river winds its way down through the Sacramento Mountains, which are part of the Lincoln National Forest and through the village of Ruidoso, which was named after the river. Just east of Ruidoso two major tributaries, Cedar Creek and Carrizo Creek flow into the Rio Ruidoso.
The "Atlas of Oregon" ranks 31 rivers in the state by average streamflow; the top five are the Columbia, Snake, Willamette, Santiam, and Umpqua. Not all Oregon rivers with high average flows are on this list of longest streams because neither their main stems nor any of their tributaries (including what are called "forks") are at least 50 miles (80 km) long. High-flow streams mentioned in the "Atlas" but not included in this long-stream list are the Metolius, Hood, Youngs, and Coos rivers. On the other hand, the list includes four low-flow intermittent streams—Dry River, Rattlesnake Creek, Rock Creek, and Dry Creek—that cross parts of the Oregon High Desert.
The river has three forks: the South Fork, Wheatfield Fork and the North Fork. The South Fork is the longest and travels northwest, parallel to the coast along the San Andreas Fault rift zone. The Wheatfield Fork begins west of Lake Sonoma and has the largest flow of the three forks. Its tributaries include Tombs, Wolf, House, Haupt and Fuller creeks. Wheatfield is the first fork to combine with the South Fork. Buckeye Creek, a tributary of the river, joins the South Fork next. It is followed by Rockpile Creek and Big Pepperwod Creek. The North Fork is the only part of the river in Mendocino County. It travels roughly southwest towards the coast along the San Andreas Fault rift zone and meets the South Fork at the border between the counties, a few miles before the river flows into the ocean.