Geography

Types of Coastlines

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Updated:4/9/2026
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Coastline Type
Formed By
Famous Example
Region
Known For
Fjord
Glacial erosion of U-shaped valleys flooded by seaSognefjordNorwayDeep narrow inlets with steep walls, carved by Ice Age glaciers, most dramatic in Norway, NZ, Chile
Ria
Flooded river valleys after sea level riseGalician RiasSpainBranching funnel-shaped estuaries, look like fjords but V-shaped, excellent natural harbors
Cliff
Wave erosion of resistant rockWhite Cliffs of DoverEnglandVertical or near-vertical rock faces at the shore, dramatic drop-offs, chalk or limestone often
Barrier island
Longshore drift and wave action depositing sandOuter BanksUnited StatesLong narrow sand islands parallel to coast, protect mainland lagoons, shift over time
Dune coast
Wind deposition of sandGreat Dune of PylaFranceRolling sand hills pushed inland by prevailing wind, fragile dune ecosystems
Estuary
River meeting sea in partially enclosed basinChesapeake BayUnited StatesBrackish water mixing, vital nurseries for fish and birds, usually sheltered
Delta
River sediment deposited at the mouthNile DeltaEgyptFan or bird-foot shaped sediment plains, extremely fertile, densely populated historically
Tombolo
Sand deposition connecting island to mainlandChesil Beach and PortlandEnglandSand spit tying an island to the coast, rare and geologically striking
Atoll
Coral growth around a sinking volcanic islandMaldivesIndian OceanRing-shaped coral reef enclosing a lagoon, classic tropical paradise form
Mangrove coast
Salt-tolerant trees trapping sedimentSundarbansBangladesh/IndiaDense tidal forests, hurricane buffer, Bengal tiger habitat, rich biodiversity
Rocky headland
Differential erosion of hard and soft rockCape PointSouth AfricaJutting promontories alternating with bays, shipwreck coasts, lighthouses
Sea cave and arch
Wave action on weaknesses in cliff rockDurdle DoorEnglandArches collapse into stacks, Jurassic Coast UNESCO site, photographer favorite
Shingle beach
Wave deposition of pebbles and cobblesBrighton BeachEnglandSteep pebble slopes, loud wave wash, less tourist-friendly than sand
Coral reef coast
Living coral colonies along warm shallow shelvesGreat Barrier ReefAustraliaReef-protected lagoon shores, world's largest living structure at 2300 km
Skerry / Archipelago
Glacial scouring leaving small rocky isletsStockholm ArchipelagoSwedenThousands of low rocky islands, Baltic sailing paradise
Volcanic coast
Lava flows meeting the seaBig Island HawaiiUnited StatesBlack sand beaches, lava tubes, dramatic new land being formed

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