High Quality Content by WIKIPEDIA articles! Buffalo Bayou is a main waterway flowing through Houston, in Harris County, Texas, USA. It begins in Katy, Fort Bend County, Texas and flows approximately 53 miles (85 km) east to the Houston Ship Channel and then into Galveston Bay and the Gulf of Mexico. Along the way the bayou receives several significant tributary bayous, such as White Oak Bayou, Greens Bayou, and Brays Bayou and passes by several major parks and numerous smaller neighborhood parks.