Jeju Island, the Island That Cannot Hold Rain

Jeju Island receives nearly 4 billion tons of rain annually. However, in the past, Jeju residents had to carry water and walk for hours. This was because the porous basalt of the volcanic island was riddled with holes, causing rain to seep directly into the ground as soon as it fell. As a result, villages were all lined up in a circle along the coast, where the water that seeped underground would resurface upon meeting the sea. Nowadays, they drill wells to pump water directly, and it's said that this water is naturally filtered as it passes through the volcanic rock layers for decades.