Gansu is an important province in northwest China. Being abbreviated as ''Gan'' or ''Long'', it is situated as geographical center, on the middle and upper reaches of the Yellow River and the Yangtze River, and at the juncture of the Loess Plateau, Inner Mongolia Plateau and the Qinghai Tibet Plateau. It faces Shaanxi Province in the east, boards Sichuan and Qinghai provinces on the south and southwest, and adjoins Xinjiang Uygur Autonomous Region in the northwest. It is bounded on the north by Inner Mongolia Autonomous Region and the People's Republic of Mongolia and joined by Ningxia Hui Autonomous Region in the northeast. Being located between 92.13 and 108.46 degrees east and 32.31 and 42.57 degrees north, Gansu is about 1,520 kilometers long from east to west, 1,655 kilometers in its widest place and only 25 kilometers in the narrowest place.