The Sargasso Sea, located entirely within the Atlantic Ocean, is the only sea without a land boundary. Mats of free-floating sargassum, a common seaweed found in the Sargasso Sea, provide shelter and habitat to many animals.

Under normal conditions, the correct sequential developments of features made by fluvial action are Waterfalls - River terraces – Meander bars - Oxbow lakes.

Maximum amount of herring fish is obtained from The North Sea around the Netherlands. The North Sea has long been the site of important European shipping lanes as well as a major fishery.

The largest reserves of fresh water on the Earth's surface is in North America. The American Great Lakes account for 21% of the Earth's surface fresh water.