Space Shuttle image of Umboi Island (north to upper right) | |
Umboi Island is to the west of New Britain | |
| Geography | |
|---|---|
| Coordinates | 5°32′S147°52′E / 5.533°S 147.867°E /-5.533; 147.867 |
| Archipelago | Bismarck Archipelago |
| Area | 930 km2 (360 sq mi) |
| Highest elevation | 1,335 m (4380 ft) |
| Highest point | Mount Talo |
| Administration | |
Papua New Guinea | |
| Province | Morobe Province |
| LLG | Siassi Rural LLG |
Umboi (also namedRooke orSiassi) is avolcanicisland between the mainland ofPapua New Guinea and the island ofNew Britain. It is separated from New Britain by theDampier Strait, andHuon Peninsula andNew Guinea by theVitiaz Strait. It has an elevation of 1,335 metres (4,380 feet).
The Siassi Archipelago lies off the southeast coast of Umboi Island (a total of 18 islands, only seven are inhabited).
During the mid-1920s, the population of the Siassi Islands was a little over 700 people. It had more than doubled (to almost 1700 people) by the early 1960s, and then decreased to a little more than 1600 people by the early 1980s.
In 1936 a Lutheran mission was established on the island which was headed by Pastor P.H. Freund. in 1940 Freund was recruited byLt. Commander Eric Feldt of the Royal Australian Navy to act as aCoastwatcher.[1]
During 1943 the island was briefly occupied by 500 Japanese troops from the 51st Reconnaissance Regiment which was commanded by Col. Jiro Sato. By early December 1943, after several allied bombing runs, the Japanese withdrew from the island.[1]
The Siassi support themselves through traditional trade based on a barter system; they are important middlemen who deliver pigs, pots and ornate wooden bowls by sea in their canoes.[2] The people of the Siassi islands continue to believe in witchcraft and consider it to be the root cause of unfortunate events such as illness or crop failure.[3][4] The regional word for witchcraft is sanguma and the accused are often murdered.[4]
A majority of the buildings on the Siassi islands are constructed usingvernacular architecture.[2]
Languages are PapuanKovai; and Austronesian:Mbula,Karanai, andSaveng languages.[5]

The volcano is described as a complex Holocene volcano and has no recorded eruptions.[6]
Localfolklore claims that a largebioluminescent winged creature, referred to as a Ropen, can be observed flying around the skies of this and other surrounding islands.[7] ModernCryptozoologists are still searching for this creature and no definitive evidence has ever been discovered.[8]
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