Where does the Sacramento River end?
Sacramento River
On May 14, 2007, onlookers and media spotted two humpback whales traveling the deep waters near Rio Vista.  The duo, generally believed to be mother and calf (Delta, the mother and Dawn, her calf), continued to swim upstream to the deep water ship channel near West Sacramento, about 90 miles (140km) inland.  There was concern because the whales had been injured, perhaps by a boat's propeller or keel, leaving a gash in each whale's skin.  The whales were carefully inspected by biologists and injected with antibiotics to help prevent infection. After days of efforts to lure (or frighten) the whales in the direction of the ocean, the whales eventually made their way south into San Francisco Bay, where they lingered for several days.[108] By May 30, 2007, the cow and calf apparently slipped out unnoticed under the Golden Gate Bridge into the Pacific Ocean, likely under cover of night.[109][110]