The mouth of the Lanyang River is being pulled apart faster than the silting process can fill it in, so while rivers around the world extend their deltas outward, this area finds the sea biting further inland every year. The earth's crust turns out to be quite the practical joker! '
蘭陽溪攜帶而下的砂石填不滿一直被拉開的宜蘭腹地，因此全世界的三角洲都向外延伸，唯獨宜蘭三角洲向內加大，板塊真愛開玩笑！這一股拉張的力量也波及台北。