北回归线
Yushan is also notable in containing the highest point on the Tropic of Cancer and the only point on that circle of latitude where there is any evidence of Quaternary glaciation. As recently as seventeen thousand years ago, permanent ice caps existed throughout Taiwan's highest mountains and extended owing to the wet climate down to ; whereas currently, the nearest glaciers to the Tropic of Cancer are in Mexico on the Iztaccíhuatl volcano.