There are a tremendous number of islands along the coast and two major rivers: the Tapi River and Phum Duang River, which join at the town Tha Kham shortly before they drain into the Bandon Bay. All rivers flow east of the province to the Gulf of Thailand. The delta of these rivers, locally known as „Nai Bang‟, is located directly north of the city Surat Thani. It consists of several channels with small islands mostly covered with mangrove or orchards.