question: The Amargosa tryonia is located in an intermittent waterway how many miles long?
answer: 185 miles
context: Title: Amargosa tryonia
  Passage: The Amargosa tryonia, scientific name Tryonia variegata, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.  This species is endemic to the United States.  The common name refers to the Amargosa River.
  Title: Gillespie Creek (New Mexico)
  Passage: Gillespie Creek is an intermittent stream or arroyo in Hidalgo County, New Mexico.  Gillespie Creek is 11 miles long, that heads in the Animas Mountains at , and flows northeasterly until it ends in the Playas Valley, at an elevation of 4,587 feet / 1,398 meters.  Its waters in flood would reach Playas Lake.  Its mouth is located 24 miles south southeast of Animas.  Bennett Creek is a tributary that has its confluence with Gillespie Creek at an elevation of 4,902 feet / 1,494 meters.
  Title: Saratoga Springs (Death Valley)
  Passage: Saratoga Springs is a desert oasis located in southern Death Valley National Park in California.  The wetland lies at the southern tip of the Ibex Hills, on the floor of Death Valley and just northeast of the Amargosa River.  Several springs overflow into pools totaling 6.6 acres (2.7 ha) in area, making the site the third largest marsh in the park.  The pools provide habitat for several endemic species, including the Saratoga Springs pupfish.  Other rare species present include the Amargosa tryonia snail, the Amargosa springsnail, the Saratoga Springs belostoma bug, the Amargosa naucorid bug, and the Death Valley June beetle.  Plant life includes common reeds, bulrush and saltgrass.
  Title: San Antonio River
  Passage: The San Antonio River is a major waterway that originates in central Texas in a cluster of springs in Midtown San Antonio, approximately four miles north of Downtown, and follows a roughly southeastern path through the state.  It eventually feeds into the Guadalupe River about ten miles from San Antonio Bay on the Gulf of Mexico.  The river is 240 miles long and crosses five counties: Bexar, Goliad, Karnes, Refugio, and Wilson.
  Title: Landsat program
  Passage: The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth.  On July 23, 1972 the Earth Resources Technology Satellite was launched.  This was eventually renamed to Landsat.  The most recent, Landsat 8, was launched on February 11, 2013.  The instruments on the Landsat satellites have acquired millions of images.  The images, archived in the United States and at Landsat receiving stations around the world, are a unique resource for global change research and applications in agriculture, cartography, geology, forestry, regional planning, surveillance and education, and can be viewed through the U.S. Geological Survey (USGS) 'EarthExplorer' website.  Landsat 7 data has eight spectral bands with spatial resolutions ranging from 15 to 60 meters; the temporal resolution is 16 days.  Landsat images are usually divided into scenes for easy downloading.  Each Landsat scene is about 115 miles long and 115 miles wide (or 100 nautical miles long and 100 nautical miles wide, or 185 kilometers long and 185 kilometers wide).
  Title: Radok Lake
  Passage: Radok Lake is a meltwater lake about 4 miles long and marked by a slender glacier tongue feeding into it from the west, lying 3 miles south-west of Beaver Lake and 15 miles south-east of the Aramis Range, Prince Charles Mountains.  Plotted by Australian National Antarctic Research Expeditions (ANARE) from air photos taken by the RAAF Antarctic Flight in 1956.  Named for Uwe Radok, Reader (head) of Meteorology Dept at the University of Melbourne, who greatly assisted Australian National Antarctic Research Expeditions (ANARE)'s glaciological program.  Radok Lake is the deepest (362 m) known lake on the Antarctic continent and the only known freshwater lake to host a floating ice tongue glacier.  Drained by 3 miles long Pagodroma Gorge in to Beaver Lake.
  Title: Amargosa River
  Passage: The Amargosa River is an intermittent waterway, 185 miles (298 km) long, in southern Nevada and eastern California in the United States.  It drains a high desert region, the Amargosa Valley in the Amargosa Desert northwest of Las Vegas, into the Mojave Desert, and finally into Death Valley where it disappears into the ground aquifer.  Except for a small portion of its route in the Amargosa Canyon in California and a small portion at Beatty, Nevada, the river flows above ground only after a rare rainstorm washes the region.  A 26-mile (42 km) stretch of the river between Shoshone and Dumont Dunes is protected as a National Wild and Scenic River.  At the south end of Tecopa Valley the Amargosa River Natural Area protects the habitat.
citations: Amargosa tryonia Amargosa River