Bujumbura is the capital and largest city and main port of Burundi and ships most of the country's chief export, coffee, as well as cotton, skins, and tin ore. It is located on the northeastern shore of Lake Tanganyika. The city center is a colonial town with a large market, the national stadium, a large mosque, and the cathedral for the Archdiocese of Bujumbura. Museums in the city include the Burundi Museum of Life and the Burundi Geological Museum. Other nearby attractions include the Rusizi National Park, the Livingstone-Stanley Monument at Mugere, the presidential palace and the source of the southernmost tributary of the Nile, described locally as the source of the Nile.