An ancient form of the character 'Chen' consisted of two characters, meaning town in forest. Chen, as a county was first built in the Qin Dynasty under the administration of Changsha Shire. Through a thousand years of changes, the Chenzhou has always been the center of administrative organizations here. Mountainous and hilly areas make up about three fourths of the city. The terrain generally declines from the southeast to the northwest. Mountains occupy the main part of its southeast region, while the northwest is mixed with hills, hillocks and plains. Dongjiang Lake is in the upper reaches of Dongjiang River in Zixing City. Doushuai Island is the largest island in the lake, with an amazing limestone cave.