a large natural stream of water (larger than a creek); "the river was navigable for 50 miles"
6
earth
the loose soft material that makes up a large part of the surface of the land surface; "they dug into the earth outside the church"
3
floor
the ground on which people and animals move about; "the fire spared the forest floor"
2
bed
a depression forming the ground under a body of water; "he searched for treasure on the ocean bed"
1
course
general line of orientation: "the river takes a southern course"; "the northeastern trend of the coast"
1
path
a line or route along which something travels or moves: "the hurricane demolished houses in its path"; "the track of an animal"; "the course of the river"