The river mouth at Gulf of Tomini is located at the border between village Girisa, district of Paguyaman, Boalemo Regency and village Bilato, district Boliyohuto, Gorontalo Regency.

From the middle to the downstream it flows through districts of Asparaga, and Boliyohuto in Gorontalo Regency.

[3] The upstream area of Paguyaman River is on the high plain of mountains with a deep contour, whereas the middle part is a low plain/alluvial.

Near the downstream, Paguyaman cuts through the low mountains of Batulayar until discharging in the coastal zone with an elevation less than 1.0 m above the sea level.

[4] Paguyaman River has about 146 tributaries,[4] the bigger ones, among others: The river flows in the northern area of Sulawesi island with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).