The City and Lake of Houston, USA29.7N 95.3W
Houston is the fourth-largest city in the United States and the largest city within the state of Texas. As of the 2008, the estimated population of the city was 2.3 million within an area of 600 square miles (1,600 km²).
Fifteen miles (24 km) northeast of the city center is Lake Houston, a reservoir on the west fork of the San Jacinto River. It serves as the primary municipal water supply for the city of Houston and much of the surrounding area.