Its centre is in Pingguo county. It consists with the administrative center of the ancient si 'en prefecture.

A woman, taking shelter from Typhoon Morakot, rests in a temporary evacuation centre in Chiatung, in southern Taiwan's Pingtung county on August 9, 2009.

The county of Dulan was the centre of the Tuyuhun. The now-existing ancient grave—Reshuixuewei is the important cultural relics of the Tuyuhun.