The Guangdong province is the homeland of numerous Chinese dialects including Yue, Hakka (Kejia), Min and the unclassified Shaozhou tuhua 韶州土話, which have already been described in The Language Atlas of China (1987). There are still some newly found dialects, namely, Junhua 軍話, Jiushizheng 舊時正 and Southwestern Mandarin. The authors of this article demonstrate that both natural geography and historical geography play important roles to the distribution of Guangdong dialects.