Many alluvial fan terraces, which are about 60 to 100 meters higher than the present riverbed, developed along the upper reach of Lanyang River.

• 摘要兰阳溪流域上游，分布许多冲积扇阶地，最高的本流侧阶地崖可达约60-100公尺，大多全部露出砾石层。