Guo Pu
The work is much expanded from its source text, the older (and now lost) "Water Classic" ("Shuijing" 水經). The original text described 137 different rivers in China and was traditionally credited to Eastern Han scholar and geographer Sang Qin (桑钦) during the Three Kingdoms Period (220-280 AD). Qing dynasty scholars gave it a later date (during the Three Kingdoms Period) because of the names of the counties and commanderies. Its authorship was then attributed to Jin dynasty scholar Guo Pu. Li Daoyuan's 40-volume, 300,000-character version includes 1252 rivers.