Bangladesh

The Barind is a somewhat elevated triangular wedge of land that lies between the floodplains of the upper Padma and Jamuna rivers in northwestern Bangladesh. A depression called the Bhar Basin extends southeast from the Barind for about 100 miles (160 km) to the confluence of the Padma and Jamuna. This area is inundated during the summer monsoon season, in some places to a depth exceeding 10 feet (3 metres). The drainage of the western part of the basin is centred in the vast marshy area called the Chalan wetlands, also known as Chalan Lake. The floodplains of the Jamuna, which lie north of the Bhar Basin and east of the Barind, stretch from the border with Assam in the north to the confluence of the Padma and Jamuna in the south. The area is dominated by the Jamuna, which frequently overflows its banks in devastating floods. South of the Bhar Basin is the floodplain of the lower Padma.In north-central Bangladesh, east of the Jamuna floodplains, is the Madhupur Tract. It consists of an elevated plateau on which hillocks ranging in height from 30 to 60 feet (9 to 18 metres) give contour to cultivated valleys. The Madhupur Tract contains sal trees, whose hardwood is comparable in value and utility to teak. East of the Madhupur Tract, in northeastern Bangladesh, is a region called the Northeastern Lowland. It encompasses the southern and southwestern parts of the Sylhet area (including the valley plain of the Surma River) and the northern part of the Mymensingh area and has a large number of lakes. The Sylhet Hills in the far northeast of the region consist of a number of hillocks and hills ranging in elevation from about 100 feet (30 metres) to more than 1,100 feet (330 metres).In east-central Bangladesh the Brahmaputra River in its old course (the Old Brahmaputra River) built up the flood basin of the Meghna River, the region that includes the low and fertile Meghna-Sitalakhya Doab (the land area between those rivers). This area is enriched by the Titas distributary, and land areas are formed and changed by the deposition of silt and sand in the riverbeds of the Meghna River, especially between Bhairab Bazar and Daudkandi. Dhaka is located in this region.