Tank Rock Introduction
Tank Rock is a rock formation off the coral reef coast that resembles a tank, covered with green seaweed. The rock has large holes that can be seen through, and lucky visitors may spot local cattle and sheep moving about, creating a stunning view. The geology of Lanyu primarily consists of andesitic lava rich in hornblende and basaltic agglomerates, along with Pleistocene red clay layers, raised coral reefs, and Holocene alluvial layers, colluvial layers, and coastal fringing reefs. Through the natural processes of marine erosion and weathering, Lanyu has been shaped into a landscape of fascinating rock formations. In addition to Tank Rock, other notable rock formations on Lanyu include Red Head Rock, Crocodile Rock, Twin Lions Rock, Dragon Head Rock, Old Man Rock, Elephant Nose Rock, Hen Rock, Five Holes Cave, Jade Girl Rock, Helmet Rock, Battleship Rock, and Bun Rock.