About: San Augustine Park is a highly developed camping area located on the southeast shore of Sam Rayburn Reservoir on the Ayish Bayou tributary. Sam Rayburn Reservoir is located in the Piney Woods of southeast Texas, approximately 18 miles north of Jasper. The park features 100 sites with electric and water hook-ups. Additional amenities include a group shelter, swimming beach, volleyball courts, basketball court, playground, interpretive trail, public phone, boat launch, hot showers, and dump station.