Types of Coastlines
Coastline Type↕ | Formed By↕ | Famous Example↕ | Region↕ | Known For↕ |
|---|---|---|---|---|
Fjord | Glacial erosion of U-shaped valleys flooded by sea | Sognefjord | Norway | Deep narrow inlets with steep walls, carved by Ice Age glaciers, most dramatic in Norway, NZ, Chile |
Ria | Flooded river valleys after sea level rise | Galician Rias | Spain | Branching funnel-shaped estuaries, look like fjords but V-shaped, excellent natural harbors |
Cliff | Wave erosion of resistant rock | White Cliffs of Dover | England | Vertical or near-vertical rock faces at the shore, dramatic drop-offs, chalk or limestone often |
Barrier island | Longshore drift and wave action depositing sand | Outer Banks | United States | Long narrow sand islands parallel to coast, protect mainland lagoons, shift over time |
Dune coast | Wind deposition of sand | Great Dune of Pyla | France | Rolling sand hills pushed inland by prevailing wind, fragile dune ecosystems |
Estuary | River meeting sea in partially enclosed basin | Chesapeake Bay | United States | Brackish water mixing, vital nurseries for fish and birds, usually sheltered |
Delta | River sediment deposited at the mouth | Nile Delta | Egypt | Fan or bird-foot shaped sediment plains, extremely fertile, densely populated historically |
Tombolo | Sand deposition connecting island to mainland | Chesil Beach and Portland | England | Sand spit tying an island to the coast, rare and geologically striking |
Atoll | Coral growth around a sinking volcanic island | Maldives | Indian Ocean | Ring-shaped coral reef enclosing a lagoon, classic tropical paradise form |
Mangrove coast | Salt-tolerant trees trapping sediment | Sundarbans | Bangladesh/India | Dense tidal forests, hurricane buffer, Bengal tiger habitat, rich biodiversity |
Rocky headland | Differential erosion of hard and soft rock | Cape Point | South Africa | Jutting promontories alternating with bays, shipwreck coasts, lighthouses |
Sea cave and arch | Wave action on weaknesses in cliff rock | Durdle Door | England | Arches collapse into stacks, Jurassic Coast UNESCO site, photographer favorite |
Shingle beach | Wave deposition of pebbles and cobbles | Brighton Beach | England | Steep pebble slopes, loud wave wash, less tourist-friendly than sand |
Coral reef coast | Living coral colonies along warm shallow shelves | Great Barrier Reef | Australia | Reef-protected lagoon shores, world's largest living structure at 2300 km |
Skerry / Archipelago | Glacial scouring leaving small rocky islets | Stockholm Archipelago | Sweden | Thousands of low rocky islands, Baltic sailing paradise |
Volcanic coast | Lava flows meeting the sea | Big Island Hawaii | United States | Black sand beaches, lava tubes, dramatic new land being formed |
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