The region, also known by its former Oklahoma Department of Tourism designation, Arbuckle Country or Lake and Trail Country, has three distinct centers of commerce and culture, Ardmore, Ada and Durant, though it retains a largely rural nature, and is populated with many small towns and ranches. It also contains a large portion of the Cross Timbers region, transitioning from a heavily wooded area (with native oaks, elms and other eastern varieties) to a rolling savanna in the west, occasionally broken by cedar and mesquite trees. In addition to abundant water resources latent in the Arbuckle-Simpson Aquifer, the region has some of the highest oil and gas production in the state, with Carter County seated as the largest producer in the state.