Guangxi Zhuang Autonomous Region is a provincial administrative region of People's Republic of China (PRC), commonly known as Guangxi, with Nanning as its capital. Located in the southern coast of China, east longitude10426'-1204', north latitude 20 54'-26 24', the Tropic of Cancer runs through the middle of this area.

It borders Guangdong Province in the east, Beibu Gulf in the south and Hainan Province across the sea, Yunnan Province in the west, Hunan Province in the northeast, Guizhou Province in the northwest and the Socialist Republic of Vietnam in the southwest.

Guangxi is adjacent to Beibu Gulf in the south and belongs to the South China Sea. The mainland coast starts from the Simi estuary in Hepu County in the east and reaches the Beilun estuary at the junction of China and Vietnam in the west. Its mainland coastline is about 1.595 km, and its island coastline is 46 1 km. ? Nanliujiangkou, Qinjiangkou is a delta coast; Tieshan port, Dafeng estuary, Maolingjiangkou,? Fangcheng estuary inundates the coast for the valley; Qinzhou and? Fangchenggang and Fangchenggang coastal areas are coastal mountainous areas. Beihai and Hepu are platform-type coasts.

There is a large beach in Guangxi, with an area equivalent to 1005㎞? . 0-20m shallow sea is vast, with an area of 6488 "? . The whole Beibu Gulf covers an area of about 129300 square kilometers, starting from Leizhou Peninsula and Qiongzhou Strait in the east, reaching Hainan Island in the southeast, Guangxi in the north and Vietnam in the west.

The seabed in the bay is flat and gradually inclines from northeast to southwest, with an inclination of less than 2, and the water depth is generally 20-50 meters, with the deepest not exceeding 90 meters. There are 697 islands along the coast of Guangxi, with a total area of about 84 "? Weizhou Island, the largest area of which is about 28 square kilometers. ?