TETRA has trails rides across the state of Texas, which is the second largest US state that has an area of 261,797 square miles, and has 254 counties. Due to the size of our state, TETRA has found it necessary to divide the state into 12 Regions to assure each member is represent no matter if they live in the Panhandle, North Central Texas, the Pineywoods, Gulf Coast, South Texas, Hill Country, or the Big Bend region.