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Archipelago

    Papua New Guinea

    5°38′S 147°55′E

    Siassi Islands

    Part of Papua New Guinea

    Siassi Islands

    Unknown author / Public domain

    Chart

    22 landforms

    Major islands

    1
    • Umboi Island

      Umboi Island

      Area
      866 km²
      High point
      1,609 m

      Umboi (also named Rooke or Siassi) is a volcanic island between the mainland of Papua New Guinea and the island of New Britain. It is separated from New Britain by the Dampier Strait, and from New Guinea's Huon Peninsula by the Vitiaz Strait. It has an elevation of 1,335 metres (4,380 feet).

    Minor islands

    7

    • Tolokiwa Island

      Area
      44.3 km²
      High point
      1,369 m

    • Sakar Island

      Area
      43.4 km²
      High point
      992 m

    • Malai Island

      Area
      0.89 km²
      High point
      23 m

    • Unnamed island

      Area
      0.88 km²
      High point
      12 m

    • Ritter Island

      Area
      0.28 km²
      High point
      79 m

    • Unnamed island

      Area
      0.18 km²
      High point
      7 m

    • Unnamed island

      Area
      0.14 km²
      High point
      10 m

    Islets

    14
    • Unnamed island9 m · 0.08 km²
    • Unnamed island8 m · 0.08 km²
    • Aronaimutu Island4 m · 0.05 km²
    • Mandok Island20 m · 0.05 km²
    • Unnamed island9 m · 0.04 km²
    • Aromot Island4 m · 0.03 km²
    • Por Mandok Island7 m · 0.03 km²
    • Unnamed island11 m · 0.02 km²
    • Unnamed island4 m · 0.02 km²
    • Unnamed island4 m · 0.02 km²
    • Unnamed island5 m · 0.02 km²
    • Unnamed island6 m · 0.01 km²

    Also in the area

    5

    Inside the group's outline but not confirmed as members by any source.

    • Tuam Island35 m · 0.92 km²
    • Unnamed island21 m · 0.06 km²
    • Unnamed island11 m · 0.04 km²
    • Unnamed island10 m · 0.01 km²
    • Unnamed island0.6 ha

    Figures

    Comparative heights

    Sea level500 m1,000 m1,500 m2,000 m1,609 mUmboi1,369 mTolokiwa992 mSakar79 mRitter35 mTuam23 mMalai20 mMandok10 mHein7 mPor Mandok4 mAronaimutu4 mAromot
    High points by island, metres above sea level.

    Islands by area

    0.0010.010.11101001,000Umboi: 866 km²UmboiTolokiwa: 44.3 km²TolokiwaSakar: 43.4 km²SakarTuam: 0.92 km²TuamMalai: 0.89 km²MalaiUnnamed island: 0.88 km²Unnamed islandRitter: 0.28 km²RitterUnnamed island: 0.18 km²Unnamed islandUnnamed island: 0.14 km²Unnamed islandUnnamed island: 0.08 km²Unnamed islandUnnamed island: 0.08 km²Unnamed islandUnnamed island: 0.06 km²Unnamed islandAronaimutu: 0.05 km²AronaimutuMandok: 0.05 km²MandokUnnamed island: 0.04 km²Unnamed islandUnnamed island: 0.04 km²Unnamed islandAromot: 0.03 km²AromotPor Mandok: 0.03 km²Por MandokUnnamed island: 0.02 km²Unnamed islandUnnamed island: 0.02 km²Unnamed islandUnnamed island: 0.02 km²Unnamed islandUnnamed island: 0.02 km²Unnamed islandUnnamed island: 0.01 km²Unnamed islandUnnamed island: 0.01 km²Unnamed islandUnnamed island: 0.01 km²Unnamed islandHein: 0.9 haHeinUnnamed island: 0.6 haUnnamed island
    km², log scale
    Umboi Island866 km²
    Tolokiwa Island44.3 km²
    Sakar Island43.4 km²
    Tuam Island0.92 km²
    Malai Island0.89 km²
    Unnamed island0.88 km²
    Ritter Island0.28 km²
    Unnamed island0.18 km²
    Unnamed island0.14 km²
    Unnamed island0.08 km²
    Unnamed island0.08 km²
    Unnamed island0.06 km²
    Aronaimutu Island0.05 km²
    Mandok Island0.05 km²
    Unnamed island0.04 km²
    Unnamed island0.04 km²
    Aromot Island0.03 km²
    Por Mandok Island0.03 km²
    Unnamed island0.02 km²
    Unnamed island0.02 km²
    Unnamed island0.02 km²
    Unnamed island0.02 km²
    Unnamed island0.01 km²
    Unnamed island0.01 km²
    Unnamed island0.01 km²
    Hein Island0.9 ha
    Unnamed island0.6 ha

    Overlapping groups

    Sources

    Facts

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

    Photographs