Amboseli National Park, formerly Maasai Amboseli Game Reserve is in Kajiao 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. The park protects two of the five main swamps, and includes a dried-up Pleistocene lake and semi-arid vegetation.