Mason County, TX exists slightly southwest of Austin within Central Hill Country Region containing around 920 square miles and populated by nearly 5000 people scattered throughout 5 incorporated cities plus multiple unincorporated communities along FM 505 highway corridor. Its main attractions include scenic views along the Llano River amongst steep canyon walls along Willow City Loop Trail plus specific recreation areas where activities likes swimming or kayaking can be enjoyed at further locations downriver near Mason city's public park system .