 In the east, the small Jingshan Range (in the southern part of the Xiangyang Prefecture) can be viewed as the extreme extension of the Daba Mountains.In the northeast, the Wudang Mountains are nearby; some authors even consider them a "branch" of the Daba Mountains.In the rural counties of southern Hanzhong, in Shaanxi Province, there is a large area of karst with some of the largest sinkholes in the world, known as the Shaanxi tiankeng cluster or "Hanzhong tiankeng group".