Circle C Ranch is a large master-planned community in southwest Austin, Texas, USA. Development of Circle C Ranch began in 1982, with the first homes in the community in built in 1986. During development, the subdivision was featured prominently in a long and contentious environmental legal battle regarding urban development in the vicinity of Barton Springs and over Edwards Aquifer. The controversy surrounding its development and later annexation by the city of Austin was a landmark in municipal annexation rights in Texas. Today, Circle C Ranch includes more than 5,620 homes.