Austin, the state capital of Texas and seat of Travis County, is the fourth-largest city in Texas. It is situated in the south-central part of the state on the Colorado River. Austin has a growing commercial and diversified manufacturing sector. Civilian government employment is 20% of the labor force and is important to the economy. As home to the University of Texas, Austin is a major center for research and development and is nationally recognized as a high-technology center. Austin's visitor attractions include the Austin Museum of Art, the Lyndon B. Johnson Library and Museum, the Lady Bird Johnson Wildflower Center, and the Austin Zoo.