The Parliament of Canada is the federal legislative branch of Canada, seated at Parliament Hill in the national capital, Ottawa, Ontario. The body consists of the Canadian monarch, represented by a viceroy, the governor general; an upper house: the Senate; and a lower house: the House of Commons. Each element has its own officers and organization. The governor general summons and appoints each of the 105 senators on the advice of the Prime Minister of Canada, while the 338 members of the House of Commons—called members of parliament (MPs)—are directly elected by eligible Canadian voters, with each MP representing a single electoral district, commonly referred to as a riding.