http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_mp_e0100_1070s_08.pdf

The second is from a report from Frommers.com. It states:

“Houston & East Texas — The state’s largest city (and the fourth-most-populous city in the United States), Houston is the heart of the nation’s oil and gas industry. Although not considered a primary tourist destination, Houston offers an abundance of attractions, including several excellent museums, performing arts such as the city’s excellent symphony orchestra, and a variety of outdoor activities. NASA’s Johnson Space Center made Houston famous and is the city’s most popular attraction. Nearby Galveston combines small-town easiness with a good mix of museums and children’s activities, plus beaches that draw hordes of springbreakers and families throughout the warm months. East Texas, along the Louisiana border, is a prime destination for anglers, boaters, and other outdoor recreationists.”

This is found at:

http://www.frommers.com/destinations/texas/0265020814.html

Logically, if you find that region on the map, you should have your answer.