Feni Island OC-101
The Feni Islands lie at the centre of a chain of small islands — that also includes the Green, Tanga, Tabar and Lihir groups. The chain extends to the northwest from Bougainville Island, running parallel to the island of New Ireland (150 km to the west) — see the New Ireland large size image for a panoramic view of the island arc. The chain of islands is part of an active volcanic arc system. Although the last major volcanic eruption on the islands was over 2,000 years ago, the islands are still active with numerous geysers, hot springs, boiling mud pools and offshore hydrothermal vents. Ambitle, the largest of the islands, contains the eroded remnants of a 3 km wide caldera. The Feni Islands group (sometimes referred to as the Anir Islands) consists of the two islands of Ambitle (87 km²) and Babase (23 km²), separated from one another by the 100 m wide Salat Strait. The islands are hilly with a rugged and heavily forested terrain.
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Green Island OC-231
The Green Islands (Nissan Islands) lie 63 km northwest from the Buka-Bougainville pair, 58 km southeast of the Feni Islands (see panoramic image) and 110 km east from New Ireland. They are part of the island arc system that emerges from the northern end of the Solomon chain and runs parallel to New Ireland for over 600 km. The group is composed of two units: Nissan and Pinipel, separated by around 2 km. Nissan (at right in the image) is a raised atoll-like structure (measuring 15 km in length and with a maximum width of 8 km) composed of several islands that enclose a central lagoon of 20 m to 60 m in depth. Only the main island of Nissan (which once lent its name to the group) is visible in this image, wrapping around the northern, eastern, southern and southwestern sides of the formation. The smaller islands of Barahun and Sirot are located on the northwestern side — formed where the South, Middle and North Channels connect the lagoon waters with those of the open ocean. At the lagoon centre lies the small islet of Hon. The seaward side of the islands are lined with low cliffs of up to 60 m in height.
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Nuguria Island OC-257
The northeastern edge of both PNG and Solomon Islands territory is marked by a line of medium-sized atolls and reefs that extend from southeast to northwest for some 900 km, running parallel to the islands of the Solomon and Bismark groups. The chain includes such features as the atolls of Ontong Java, Roncador Reef and Nukumanu (belonging to the Solomon Islands), and the PNG possessions of Taku'u, Kilinailau, the Nuguria Islands and the submerged Lyra Reef. Located nearly 200 km northeast of New Ireland and 126 km from the Tabar-Lihir-Tanga-Feni island arc, the Nuguria Islands consist of two closely spaced atoll formations: the larger atoll of Nuguria, that lends its name to the group, and the smaller Malum atoll situated 4 km off the northwestern tip of Nuguria. Nuguria (Abgarris Atoll) is a narrow atoll formation of 35 km in length, orientated southeast-northwest; typical widths across the atoll lie in the range of 3-8 km.
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