Five separate and distinct state universities are located within the Houston–The Woodlands–Sugar Land metropolitan area. The University of Houston is a nationally recognized Tier One research university, and is the flagship institution of the University of Houston System. The third-largest university in Texas, the University of Houston has nearly 43,000 students on its 667-acre campus in southeast Houston. The University of Houston–Clear Lake and the University of Houston–Downtown are standalone universities; they are not branch campuses of the University of Houston. The metropolitan area is home to the two largest historically black institutions in the state: Texas Southern University and Prairie View A&M University. The University of Texas Medical Branch and Texas A&M University at Galveston, a branch campus of Texas A&M University, are located in Galveston.