Crater Lakes and Salines Lakes


Crater lakes are formed by the impounding of water in the craters of extince volcanoes. These lakes have a circular outline and are surrounded by deep walls of lava. Usually Crater Lakes are very deep and their depth is the greatest near the centre. The Crater Lake of Oregon and the Caldera of Roman Campagana are some of the most outstanding lakes of this type. Such lakes are also found in the Avergne District of France and the Eifle region of Germany.
Salines lakes are the salt water lakes of arid and desert regions. These are not so short-lived as the playas and are more permanent. They have a more constant water supply but are bitter in taste because of the lack of an outlet. But these may also disappear leaving behind a ‘salt-Pan’. The best case in point is the 4000 square miles saline Lake Eyre, which lies in the ‘Dead Heart’ of Australia.

Biggest Oceans in the World


Name of Oceans
Area (Sq.Km)
Greatest known depth in feet
Place of greatest known depth
Pacific Ocean
16,52,40,000
35,410
Off Mindanao
Atlantic Ocean
8,23,60,000
30,143
Puerto Rico Trench
Indian Ocean
7,35,50,000
22,968
Off Sunda Trench
Arctic Ocean
1,39,80,000
17,850
Sumatra-Jawa
Mediterranean Ocean
1,142,000
14,435
Matapan