Colorado | Mississippi River | River Thames | Amazon River | Columbia River | Colorado Springs, Colorado | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | University of Colorado | River Tyne | Madeira River | Boulder, Colorado | Colorado Springs | Volga River | River Nene | River Clyde | River Trent | River Severn | Colorado Rockies | Aspen, Colorado | Amur River | River Wear | Allegheny River | Red River |
More recent ones (1500–300 BC) have been discovered in the Turrialba Valley, the coastal region of Gandoca, the northern plains, Sarapiquí Basin, Barva, Herradura, the Térraba River Basin, the Coto Colorado River Basin and Isla del Caño.