Almost whole of Bangladesh is a gigantic Delta region of Padma, Jamuna and Meghna. The geologist believe that the whole Bangladesh was a part of now estinct Assam Bay. The greater part of Bangladesh consists of large alluvial plainland Crisscrossed by mighty rivers canals and studded by numeroues marshes and swams. The three Principles rivers Jamuna (Brahmaputra outside Bangladesh), Padma(otherwise ganges) and Megna come together in the southern half of the country to from enormous delta. The country’s land area has brought downalluvial deposits by the major rivers. The landscape is dominated by river system. The land is mostly flat exempt for a range of hill in the Southeast and the plateau area of the North West. Only some 16% of the country is forested, mainly in sundarbans, Rangamati, Bandarban, Khagrachari, Gazipur and Tangail. Bangladesh is one of the founding members of South Asian Associaton for Regional Cooperation (SAARC), UN, ADB, IDB, OIC, BIMSTEC, and a member of the OIC and the D-8.