Amboseli National Park, formerly Maasai Amboseli Game Reserve is in Kajiado District, Rift Valley Province in Kenya. The park is 390 km2 (150 mi2) in size at the core of an 8,000 km2 (3,000 mi2) ecosystem that spreads across the Kenya-Tanzania border. The local people are mainly Maasai, but people from other parts of the country have settled there attracted by the successful tourist-driven economy and intensive agriculture along the system of swamps that makes this low-rainfall area (average 350 mm (14 in) one of the best widlife-viewing experiences in the world.