Houston is located 165 miles (266 km) east of Austin, 88 miles (142 km) west of the Louisiana border, and 250 miles (400 km) south of Dallas. The city has a total area of 627 square miles (1,620 km2); this comprises 599.59 square miles (1,552.9 km2) of land and 22.3 square miles (58 km2) covered by water. The Piney Woods are north of Houston. Most of Houston is located on the gulf coastal plain, and its vegetation is classified as temperate grassland and forest. Much of the city was built on forested land, marshes, swamp, or prairie and are all still visible in surrounding areas.[citation need...
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