Coastal horror transforms the sea into something ancient, hostile, and unknowable. Unlike coastal gothic, which often leans into melancholy ruins, windswept romance, isolated lighthouses, and decaying seaside beauty, coastal horror focuses on dread, inevitability, survival, and the terrifying feeling that the ocean is alive — and watching. These stories explore black tides, drowned villages, abandoned harbours, sea caves, shipwrecks, storm surges, coastal disappearances, and ancient things waiting beneath the waterline.

Some of the most effective coastal horror stories use atmosphere and environmental terror to create fear. The Shadow over Innsmouth by H. P. Lovecraft transforms an isolated fishing town into a place of corruption and ancient sea worship, while The Fog by John Carpenter turns rolling coastal mist into a supernatural threat carrying the dead ashore. Stories such as The Terror, Cold Skin, The Lighthouse, Dark Matter, and Dead Calm combine isolation, violent weather, maritime folklore, psychological collapse, and the terrifying indifference of the sea itself. Coastal horror frequently explores themes of obsession, survival, inherited curses, disappearing communities, drowned memory, and humanity’s helplessness against vast natural forces. These stories thrive in environments shaped by erosion, storms, and isolation — flooded graveyards, black cliffs, rusting shipwrecks, drowned forests, abandoned piers, offshore platforms, and harbours swallowed by fog. The coastline constantly changes, concealing evidence beneath tides and dragging forgotten things back to shore. In coastal horror, the sea is never just a setting. It becomes a force capable of watching, waiting, and reclaiming whatever belongs to it.