Jeolla Coast

The Jeolla Coast encompasses the southwestern corner of the Korean Peninsula and its offshore island fringe — the Dadohaehaesang National Marine Park to the south and west, and the approach to the Yellow Sea to the northwest through Mokpo. This is one of the most complex tidal environments in East Asia. The range varies dramatically over relatively short distances because the Yellow Sea is semi-enclosed and shallow, amplifying the M2 tidal constituent to an extraordinary degree on its eastern shore. At Mokpo on the Yellow Sea side, the mean spring range is 3.5–4.0 m. This is genuine macro-tidal territory. The tidal flats — getbol in Korean — that extend from the Mokpo shoreline and the surrounding islands expose for hundreds of metres at low water, revealing a layered mud ecosystem of clams, crabs, and shorebirds. At high spring water, the same area is a navigable labyrinth of island passages; at low spring, it is impassable mud flat. The fishing communities on the islands have built their lives around this rhythm for centuries. At Yeosu on the south coast facing the Korea Strait, the geometry is different — the Yellow Sea's amplified tidal wave loses energy before it rounds the peninsula's southern tip, and the spring range drops to around 1.2 m. Yeosu sits within Hallyeohaesang National Marine Park, an archipelago of 300+ islands with clear water and moderate tidal currents suitable for recreational kayaking and diving. The contrast between Mokpo and Yeosu within 150 km of each other is a sharp lesson in how bathymetry shapes tidal range. Wando, roughly halfway between the two, sits in a tidal sweet spot: spring range of 2.5–3.0 m, strong tidal currents through the island passages, and an aquaculture industry (seaweed, abalone, oyster) that depends on tidal flushing for water quality. The whole Jeolla coast is within UTC+9 (Korea Standard Time); there is no daylight saving.