All Coastal and Reef Features

Sea stacks, coastal cliffs, wave-cut platforms, reefs and related shoreline features shaped by marine and wave erosion, following the coastal erosional landform class of standard geomorphology. Includes named sea stacks (Twelve Apostles, Durdle Door, Perce Rock), wave-cut platforms and sea cliffs, and reefs and ledges lying offshore. Belongs here: any formation whose defining shape comes from the erosive action of waves and tides at a coastline. Does not belong here: a whole island or archipelago treated as a landmass in its own right (Islands and Archipelagos), or an inland karst or fluvial feature that happens to lie near a coast. This subcategory holds entries the oversized-subcategories report (ruling 926) flagged as likely mis-filed under Geological Formations rather than a coastal or marine category; a later review lane may relocate them, but each now has a real, correctly named home rather than sitting inside a catch-all erosional bucket.