The Slab is on FM 3404, 1.5 miles west of FM 1431 in Kingsland.
The Slab is a spot in the Llano River where the water runs over large pink granite outcroppings and sandy beaches have formed. It is a popular swimming, tubing and picnicking site. The water is perfect for both wading and deeper swimming. The Slab is open to the public, but not maintained as a city park. There is no drinking water or rest room facilities.