The Serra do Tiracambu
is a mountain range in Maranhão
state of north-central Brazil
. The range runs north and south, and forms the divide between the basins of the Gurupí River
to the west and the Pindaré River
to the east.
The range lies within the Tocantins-Araguaia-Maranhão moist forests ecoregion of Amazonia, and is covered by tropical moist broadleaf forest.