Two peaks, Qixing Mountain and Mt. Datun, rise to the northeast of the city. Qixing Mountain is located on the Tatun Volcano Group; its -high main peak renders it the tallest mountain at the rim of the Taipei Basin;  -high Mt. Datun is a close runner up.  These former volcanoes make up the western section of Yangmingshan National Park, extending from Mt. Datun northward to Mt. Caigongkeng (). Located on a broad saddle between two mountains, the area also contains the marshy Datun Pond.