River island

A river island is an island in a stream ( river, stream, etc.). Together with the island of the lake, it is one of the group of inland islands.

Geology

River islands exist - unlike the nearby islands in a sea - mainly from alluvial deposits or sediment, sand or gravel. In part, it is completely severed by flooding from the river bank land. Because of the constant flow of river islands are often narrow and elongated. Their shape and area may change more frequently than in other islands; this is especially true after heavy rain or flooding.

Geography

Depending on the view is completely located in Brazil during the course of the Rio Araguaia Ilha do Bananal with (currently) in the Amazon estuary with (currently) considered as the largest river island in the world 19,162 km ² or washed by various tributaries island Marajó 40.1 thousand km ². The assignment is dependent on whether the island and the sea touching Marajó is considered a true river island.