 The U.S. Office of Management and Budget combines the Houston–The Woodlands–Sugar Land metropolis with four micropolitan statistical areas (Bay City, Brenham, El Campo, and Huntsville) to form the Houston–The Woodlands, TX combined statistical area.The metropolitan area is located in the Gulf Coastal Plains biome, and its vegetation is classified as temperate grassland.Much of the urbanized area was built on forested land, marshes, swamp, or prairie, remnants of which can still be seen in surrounding areas.