The Columbia Encyclopedia, Sixth Edition. 2001-07.
Agusan
(äg´sän) (KEY) , river, c.240 mi (390 km) long, rising in the mountains of SE Mindanao, the Philippines, and flowing N past Butuan to Butuan Bay. It is navigable for small craft c.160 mi (260 km) upstream. The Agusan valley is very fertile and is one of the chief rice-growing regions of the Philippines.