a raised or elevated geological formation

extend in ridges

a long ridge or pile

a submerged (or partly submerged) ridge in a river or along a shore

a ridge of sand created by the wind; found in deserts or near lakes and oceans

(geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater from glaciers or ice sheets

a projecting ridge on a mountain or submerged under water