Longzhou County (simplified Chinese: 龙州县; traditional Chinese: 龍州縣; pinyin: Lóngzhōu Xiàn; Wade–Giles: Lung-chou Hsien; Zhuang: Lungzcouh Yen) is a county of southwestern Guangxi, China, bordering Cao Bằng province, Vietnam.

Longzhou lies in a circular valley at the junction of the Xun and Gui rivers.

[dubious – discuss] Longzhou has a monsoon-influenced humid subtropical climate (Köppen Cwa), with short, mild winters, and long, very hot and humid summers.

The monthly 24-hour average temperature ranges from 14.7 °C (58.5 °F) in January to 29.2 °C (84.6 °F) in July, and the annual mean is 23.12 °C (73.6 °F).

The annual rainfall is just above 1,300 mm (51 in), a majority of which is delivered from June to August.