Located between the Navasota and Brazos rivers in southeast central Texas, and bounded on the northwest by Robertson County, on the east by Madison and Grimes counties, on the south by Washington County, and on the southwest by Burleson County. The county was named for the nearby Brazos River. Bryan is the county seat, and College Station is the other major community in the county. It comprises 588 square miles of rolling prairie and woodlandBrazos County has been the site of human habitation for more than 12,000 years. Evidence of Paleo-Indian inhabitants in the area has turned up in the form of spearpoints, and the remains of a butchered mammoth have been found at the Duewall-Newberry Site on the Brazos River. Within the historic period, Spanish explorers reported Bidai and Tonkawa Indians in the area, and there is evidence that groups related to the Apaches and Comanches occasionally hunted buffalo as far east as Brazos County. Spanish travelers on the Old San Antonio Road passed along the northwest boundary of the future county, but there was no Spanish settlement in the area.