Is an area of low land near the sea where a river separates into many smaller rivers. This is the Okavango delta:
Tributary:
Is a river or stream that flows into a larger river. This is the Tupojoky tributary:
Lake:
Is a large area of water surrounded by land. This is the California lake:
Torrent:
Is a large amount of water moving very quickly in a particular direction. This is a torrent:
Waterfall:
Is a place where a river or stream drops down over a cliff or rock. This is a waterfall:
Bog:
Is an area of soft muddy ground:
Glacier:
Is a large mass of ice that moves slowly down a mountain valley. This is the Vatnajokull glacier:
Tide:
Is the regular rising and falling of the level of the sea:
Flow:
The smooth steady movement of the river.