The Gurupí River
is a river in north-central Brazil
which forms the boundary between Maranhão
states. The Gurupí rises in the low hills which separate its basin from that of the Tocantins River
to the south, and flows north into the Atlantic Ocean
. The Serra do Tiracambu
lies to the east, and separates the basin of the Gurupí from that of the Pindaré River
The Gurupí basin is home to tropical moist broadleaf forest, and lies within the Tocantins-Araguaia-Maranhão moist forests ecoregion.