Longgang is a county-level city under the jurisdiction of Zhejiang Province, which is managed by Wenzhou City. Located in the south of Zhejiang Province, it is adjacent to Cangnan County and Yang peace county in the north and south. Located on the south bank of the mouth of the Aojiang River, it is adjacent to the East China Sea in the east, Yongjiang River, 104 National Road, shenyang-haikou expressway and Wenfu Railway in the west, Jiangnan Plain in the south and the mainstream of the Aojiang River in the north.

Longgang City is located in the south of Wenzhou City, Zhejiang Province, on the south bank of the mouth of the Aojiang River. The absolute geographical position is120 33' east longitude and 27 35' north latitude. It is adjacent to the East China Sea in the east, Xiaojiang Town of Pingyang County and Lingxi District of Cangnan in the west, Yishan Town, Qianku and Jinxiang District of Jiangnan Plain in the south and Aojiang Town of Pingyang County across the river in the north, with a total area of 183.99 square kilometers.

Topography of Longgang city

Longgang city is relatively flat and belongs to coastal siltation plain landform. The general terrain is high in the southwest and low in the northeast. The ground elevation is 4.5 to 6 meters (Wusong elevation). Except for the low mountains in southern Banan and southern Yunyan, the eastern plain is a modern marine plain with a relatively high terrain (5 to 6 meters). The northeast end is the mouth of the Aojiang River, which is low in terrain and only 3 to 5 meters above sea level. This is a plain with dense river networks.

Subtropical warm and humid climate, active surface weathering, weathering thickness greater than10m. The flowing water is strong, the slopes are criss-crossed, and there are erosion slopes with exposed bedrock everywhere. The coastline is more than 20 kilometers long, and there are coastal islands such as Pipa Mountain.