Communities

• Lost River, Quebec

• The town of Lost River, Idaho
  Lost River, Idaho
  Lost River is a city in Custer County, Idaho, United States. The population was 68 at the 2010 census.-Geography:Lost River is located at .According to the United States Census Bureau, the city has a total area of , all of it land....
  
  
• The community of Lost River, West Virginia
  Lost River, West Virginia
  Lost River is an unincorporated community on the Lost River in eastern Hardy County, West Virginia, USA. Lost River lies along West Virginia Route 259....
  
  

Rivers

• A losing stream
  Losing stream
  A losing stream, or influent stream, is a stream or river that loses water as it flows downstream. The water infiltrates into the ground recharging the local groundwater, because the water table is below the bottom of the stream channel...
  
  , that is, a river that decreases in volume as it flows

• Lost River (Alaska), four different rivers
• Lost River (California)
  Lost River (California)
  Lost River begins and ends in a closed basin in northern California and southwestern Oregon in the United States. The river, long, flows in an arc from Clear Lake Reservoir in Modoc County, California, through Klamath County, Oregon to Tule Lake in Siskiyou County...
  
  , in California and Oregon
• Big Lost River
  Big Lost River
  The Big Lost River is a major river in the U.S. state of Idaho, about long. It starts in the Rocky Mountains and flows in a generally southeast direction into the Snake River Plain. True to its name, the Big Lost River's surface flow does not reach any larger river, but vanishes into the Snake...
  
  , Idaho
• Little Lost River
  Little Lost River
  The Little Lost River is a river in the central part of the U.S. state of Idaho. The river is about long and drains an arid farming valley, the Little Lost River Valley, bordered by the Lost River Range on the west and Lemhi Range on the east...
  
  , Idaho

• Lost River (Indiana)
  Lost River (Indiana)
  The Lost River is a river that rises in Vernon Township, Washington County, Indiana, and discharges into the East Fork of the White River in Lost River Township, Martin County, Indiana...
  
  
• Lost River (Minnesota), five different rivers
• Lost River (Montana)
• Lost River (New Hampshire)
  Lost River (New Hampshire)
  The Lost River is a stream located in the White Mountains of New Hampshire in the United States. It is a tributary of the Pemigewasset River, part of the Merrimack River watershed....
  
  
  • Lost River Reservation
    Lost River Reservation
    The Lost River Reservation is a series of caves in the White Mountains in Woodstock, New Hampshire, United States. Located west of the village of North Woodstock on New Hampshire Route 112, Lost River Reservation is set in Kinsman Notch...
    
    , comprising a series of boulder caves
• Lost River (New Mexico), two different rivers
• Lost River (Texas), an old channel of the Trinity River (Texas)
  Trinity River (Texas)
  The Trinity River is a long river that flows entirely within the U.S. state of Texas. It rises in extreme north Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the south side of the Red River....
  
  
• Lost River (Washington), two different rivers
• Lost River (Cacapon River)
  Lost River (Cacapon River)
  The Lost River is a river in the Appalachian Mountains of Hardy County in West Virginia's Eastern Panhandle region. The Lost River is geologically the same river as the Cacapon River: it flows into an underground channel northeast of Baker along West Virginia Route 259 at "the Sinks" and reappears...
  
  , in West Virginia