Sichuan, is a province in southwest China occupying most of the Sichuan Basin and the easternmost part of the Tibetan Plateau between the Jinsha River on the west, the Daba Mountains in the north, and the Yungui Plateau to the south. Chengdu is the capital of southwestern China's Sichuan province. Chengdu's history dates back to at least the 4th century B.C., when it served as capital for the Shu Kingdom. Artifacts from that dynasty are the focus of the Jinsha Site Museum. The city is also home to the famous Chengdu Research Base of Giant Panda Breeding, a conservation center where visitors can view endangered giant pandas in a natural habitat.