Vocabulary

Delta:

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.