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Ganges-Brahmaputra Delta : ウィキペディア英語版
Ganges Delta

The Ganges Delta (also known as the Ganges–Brahmaputra Delta, the ''Sunderbans Delta'', or the Bengal Delta〔) is a river delta in the South Asia region of Bengal, consisting of Bangladesh and the state of West Bengal, India. It is the world's largest delta, and empties into the Bay of Bengal. It is also one of the most fertile regions in the world, thus earning the nickname The Green Delta. The delta stretches from the Hooghly River on the west to the Meghna River on the east. It is approximately across at the Bay of Bengal. Kolkata (formerly Calcutta) and Haldia in India and Mongla and Chittagong in Bangladesh are the principal seaports of the delta.
A number of large rivers flow through the Ganges Delta, including the Padma (main distributary of the Ganges) and the Jamuna (main distributary of the Brahmaputra), which merge and then join the Meghna before entering the sea.
==Geography==

The Ganges Delta has the shape of a triangle, and is considered to be an "arcuate" delta (arc-shaped).
It covers more than , and although the delta lies mostly in Bangladesh and India, rivers from Bhutan, China, India, and Nepal drain into it from the north. Approximately two-thirds of the delta is in Bangladesh. Most of the delta is composed of alluvial soils made up by small sediment particles that finally settle down as river currents slow down in the estuary. Rivers carry these fine particles with them, even from their sources at glaciers as fluvio-glacial. Red and red-yellow laterite soils are found as one heads farther east. The soil has large amounts of minerals and nutrients, which is good for agriculture.
It is composed of a labyrinth of channels, swamps, lakes, and flood plain sediments (chars). The Gorai-Madhumati River, one of the distributaries of the Ganges, divides the Ganges Delta into two parts: the geologically young, active, eastern delta, and the older, less active, western delta.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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