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Archipelago

    Indian OceanAustralia

    28°43′S 113°47′E

    Houtman Abrolhos

    The Houtman Abrolhos (often called the Abrolhos Islands) is a chain of 122 islands and associated coral reefs in the Indian Ocean off the west coast of Australia about 80 kilometres (50 mi) west of Geraldton.

    Beacon Island in the Wallabi Group, Abrolhos Islands, Western Australia, site of the Batavia mutiny
    Beacon Island in the Wallabi Group, Abrolhos Islands, Western Australia, site of the Batavia mutiny

    Guy de la Bedoyere / CC BY-SA 4.0

    Chart

    75 landforms

    Overview

    The Houtman Abrolhos (often called the Abrolhos Islands) is a chain of 122 islands and associated coral reefs in the Indian Ocean off the west coast of Australia about 80 kilometres (50 mi) west of Geraldton. It is the southernmost true coral reef in the Indian Ocean, and one of the highest latitude reef systems in the world. It is one of the world's most important seabird breeding sites, and the centre of Western Australia's largest single-species fishery, the western rock lobster fishery. It has a small seasonal population of fishermen, and a limited number of tourists are permitted for day trips, but most of the land area is off-limits as a conservation habitat. It is the site of numerous shipwrecks, the most famous being two Dutch ships: Batavia, which was wrecked in 1629 (followed by massacre of over 100 survivors by mutineers), and Zeewijk, wrecked in 1727. The islands are an unincorporated area with no municipal government, subject to direct administration of the Government of Western Australia. In July 2019, the Houtman Abrolhos was declared a national park by the state government.

    From Wikipedia, CC BY-SA 4.0

    Census, cataloged

    • Major islands3
    • Minor islands12
    • Islets38
    • Rocks & skerries22

    Major islands

    3
    • West Wallabi Island

      West Wallabi Island

      Area
      6.1 km²
      High point
      14 m

      West Wallabi Island is an island in the Wallabi Group of the Houtman Abrolhos, in the Indian Ocean off the west coast of mainland Australia.

    • East Wallabi Island

      East Wallabi Island

      Area
      3.3 km²
      High point
      15 m

      East Wallabi Island is an island in the Wallabi Group of the Houtman Abrolhos in the Indian Ocean off the west coast of mainland Australia.

    • North Island

      North Island

      Area
      1.9 km²
      High point
      11 m

      North Island is the northernmost island in the Houtman Abrolhos, a coral reef archipelago in the Indian Ocean off the coast of Mid West Western Australia. Located about 14 km (9 mi) from the nearest island group, it is one of the largest islands in the Houtman Abrolhos, and one of the few to support dune systems.

    Minor islands

    12
    • Rat Island

      Area
      0.65 km²
      High point
      6 m
    • Middle Island

      Area
      0.21 km²
      High point
      3 m
    • Wooded Island

      Area
      0.2 km²
      High point
      4 m
    • Gun Island

      Area
      0.19 km²
      High point
      3 m
    • Suomi Island

      Area
      0.19 km²
      High point
      4 m
    • Unnamed island

      Area
      0.13 km²
      High point
      5 m
    • Alexander Island

      Area
      0.12 km²
      High point
      5 m
    • Long Island

      Area
      0.11 km²
      High point
      5 m
    • Crake Island

      Area
      0.11 km²
      High point
      4 m
    • Morley Island

      Area
      —
      High point
      4 m

      size unknown

    • Pelsaert Island

      Area
      —
      High point
      2 m

      size unknown

    • Traitors Island

      Area
      —

      size unknown

    Islets

    38
    • Campbell Island3 m · 0.09 km²
    • Unnamed island4 m · 0.08 km²
    • Unnamed island7 m · 0.08 km²
    • Unnamed island6 m · 0.05 km²
    • Pigeon Island7 m · 0.04 km²
    • Keru Island3 m · 0.04 km²
    • Beacon Island4 m · 0.03 km²
    • Unnamed island3 m · 0.02 km²
    • Unnamed island2 m · 0.02 km²
    • 1 Island1 m · 0.02 km²
    • Alcatraz Island7 m · 0.02 km²
    • Unnamed island1 m · 0.02 km²

    Rocks & skerries

    22
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha
    • Unnamed island<0.1 ha

    Figures

    Comparative heights

    Sea level5 m10 m15 m15 mEast Wallabi14 mWest Wallabi11 mNorth7 mPigeon7 mAlcatraz6 mRat5 mAlexander5 mLong4 mWooded4 mSuomi4 mCrake4 mMorley4 mBeacon4 mDry
    High points by island, metres above sea level.

    Islands by area

    0.000010.00010.0010.010.1110West Wallabi: 6.1 km²West WallabiEast Wallabi: 3.3 km²East WallabiNorth: 1.9 km²NorthRat: 0.65 km²RatMiddle: 0.21 km²MiddleWooded: 0.2 km²WoodedGun: 0.19 km²GunSuomi: 0.19 km²SuomiUnnamed island: 0.13 km²Unnamed islandAlexander: 0.12 km²AlexanderLong: 0.11 km²LongCrake: 0.11 km²CrakeCampbell: 0.09 km²CampbellUnnamed island: 0.08 km²Unnamed islandUnnamed island: 0.08 km²Unnamed islandUnnamed island: 0.05 km²Unnamed islandPigeon: 0.04 km²PigeonKeru: 0.04 km²KeruBeacon: 0.03 km²BeaconUnnamed island: 0.02 km²Unnamed islandUnnamed island: 0.02 km²Unnamed island1: 0.02 km²1Alcatraz: 0.02 km²AlcatrazUnnamed island: 0.02 km²Unnamed islandDry: 0.01 km²DryUnnamed island: 0.01 km²Unnamed islandUnnamed island: 0.01 km²Unnamed islandUnnamed island: 0.9 haUnnamed islandUnnamed island: 0.7 haUnnamed islandUnnamed island: 0.7 haUnnamed islandUnnamed island: 0.7 haUnnamed islandUnnamed island: 0.5 haUnnamed islandUnnamed island: 0.5 haUnnamed islandUnnamed island: 0.5 haUnnamed island7: 0.4 ha7Unnamed island: 0.3 haUnnamed islandUnnamed island: 0.3 haUnnamed islandUnnamed island: 0.3 haUnnamed islandUnnamed island: 0.3 haUnnamed islandUnnamed island: 0.3 haUnnamed island
    km², log scale. 4 without a known area.
    West Wallabi Island6.1 km²
    East Wallabi Island3.3 km²
    North Island1.9 km²
    Rat Island0.65 km²
    Middle Island0.21 km²
    Wooded Island0.2 km²
    Gun Island0.19 km²
    Suomi Island0.19 km²
    Unnamed island0.13 km²
    Alexander Island0.12 km²
    Long Island0.11 km²
    Crake Island0.11 km²
    Campbell Island0.09 km²
    Unnamed island0.08 km²
    Unnamed island0.08 km²
    Unnamed island0.05 km²
    Pigeon Island0.04 km²
    Keru Island0.04 km²
    Beacon Island0.03 km²
    Unnamed island0.02 km²
    Unnamed island0.02 km²
    1 Island0.02 km²
    Alcatraz Island0.02 km²
    Unnamed island0.02 km²
    Dry Island0.01 km²
    Unnamed island0.01 km²
    Unnamed island0.01 km²
    Unnamed island0.9 ha
    Unnamed island0.7 ha
    Unnamed island0.7 ha
    Unnamed island0.7 ha
    Unnamed island0.5 ha
    Unnamed island0.5 ha
    Unnamed island0.5 ha
    7 Island0.4 ha
    Unnamed island0.3 ha
    Unnamed island0.3 ha
    Unnamed island0.3 ha
    Unnamed island0.3 ha
    Unnamed island0.3 ha
    Unnamed island0.3 ha
    Unnamed island0.2 ha
    Unnamed island0.2 ha
    Unnamed island0.2 ha
    Unnamed island0.2 ha
    Unnamed island0.1 ha
    Unnamed island0.1 ha
    Unnamed island0.1 ha
    Unnamed island0.1 ha
    Unnamed island0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha
    Unnamed island<0.1 ha

    Groups within

    3

    Sources

    Facts

    • Geometry, areas and high points: OpenStreetMap contributors (ODbL), Copernicus GLO-30, via Talus.
    • Wikidata
    • Wikipedia

    Photographs