A sudden, vertical or near vertical descent of water over a step or ledge in the bed of a river.

A fast flowing section of a watercourse generally with exposed rocks or boulders.

A natural exit of water from the ground

Open earth/concrete channel that transport irrigation water from the source to other locations transversing topographic features along the way.

A naturally formed area of land, surrounded by inland water, which is above water at high tide.

A naturally formed area of land, surrounded by seawater within 3 nautical miles from the coastline, which is above water at high tide.