Map including Sansui (labeled as SAN-SUI (CHIUNG-SHUI) 三穗 (邛水)) (AMS, 1954)
Sansui County is located in the east of Guizhou and the northeast of Qiandongnan Prefecture 247 kilometres (153mi) away from the provincial capital of Guiyang and 87 kilometres (54mi) away from the prefecture seat of Kaili. It ranges in latitude from 26° 47' to 27° 04' N and in longitude from 108° 32' to 109° 04' E, spanning a total area of 1,035.8 square kilometres (399.9sqmi). Bordering counties are Xinhuang (Hunan) to the northeast, Tianzhu and Jianhe to the southeast and southwest, and Zhenyuan to the north. The county is part of the Yuan River watershed, and there is a total of 776 kilometres (482mi) of rivers within its borders.
Sansui has a monsoon-influenced humid subtropical climate (KöppenCfa), with chilly, damp winters, and hot, humid summers. The monthly daily average temperature ranges from 3.9°C (39.0°F) in January to 25.5°C (77.9°F) in July, while the annual mean is 15.4°C (59.7°F). More than half of the annual rainfall occurs from May to August, while the annual frost-free period typically lasts 290 to 300 days.
Climate data for Sansui, elevation 630m (2,070ft), (1991–2020 normals, extremes 1971–present)
