Ganzhou is a prefecture-level city in southern Jiangxi province, People's Republic of China. Its administrative seat is at Zhanggong. Ganzhou is a large city covering the southern third of Jiangxi province, with an area of 39,400 square kilometers. It borders Hunan province to the west, Guangdong to the south, and Fujian to the east, as well as the cities of Ji'an and Fuzhou to the north. More than 70% of the area is forested. The vast majority of the province, more than 83%, is also mountainous. Several of the major tributaries of the Gan River, Ganzhou's namesake, join at a confluence in the center of the city.