Manam is a basaltic-andesitic stratovolcano, the classic cone shape of the most familiar volcanoes on Earth. The lower flanks are remarkably symmetrical, which is part of what makes the island look so striking from the air or from a ship passing in the Bismarck Sea. But four distinct valleys cut from the summit to the sea, and these are the danger. They focus everything that comes down the mountain: ordinary rainwater during monsoon, ashfall after minor eruptions, and above all pyroclastic flows during major events. The earliest documented eruption was in 1616. A 2005 eruption produced a sulfur dioxide cloud so large it was tracked from orbit by NASA's Aura satellite. On 3 December 1996, pyroclastic flows reached the village of Budua, killing thirteen residents outright.

The 2004 eruption began on 24 October and was at first treated as a manageable inconvenience. Then the wind shifted. Ash and volcanic debris began falling on inhabited areas on the leeward side of the island, and the Papua New Guinea government authorized an emergency evacuation. Over 9,000 islanders were moved to the mainland at Bogia. Five people died during the eruption. By 11 December, seismic activity had dropped and the immediate threat was downgraded, but by then the population was already dispersed across temporary camps at Mangem, Asarumba, and Potsdam. The camps became a long-term problem. In March 2007, three people were killed by mudslides on the north of the island itself, and the same month the national government made land available at Andarum, near Bogia, for permanent resettlement of the displaced.

Despite the danger and despite government advice, people began going home. By 2014, somewhere between 2,000 and 3,000 Manam Islanders had returned to the island, rebuilding houses in villages they had been told not to inhabit. The reasons are familiar anywhere people return to dangerous ground: the land is theirs, the mainland camps have been difficult and sometimes desperate, and the rhythm of life that held extended families together is rooted in specific places that cannot be reproduced elsewhere. The 2022 eruption, which spewed ash 15 kilometers into the atmosphere and was picked up immediately by the Darwin VAAC, did not produce a second mass evacuation. The mountain is still active as of January 2024. So is the decision people keep making to live on it.

The islanders speak their own language, called Manam Pile, which translates literally as "Manam talk." It is also spoken on the nearby Boisa Islands. Manam Pile belongs to the Oceanic branch of the Austronesian family, a language group that spread across the Pacific on outrigger canoes. Within Papua New Guinea, where more than 800 languages are still spoken, Manam Islanders are known especially for their music. The community has produced several nationally recognized musicians. Between eruptions, the island hums with the ordinary business of tropical coastal life: gardens, fishing, the Lutheran and Catholic churches that split the religious loyalties, the voices of children who have grown up knowing that their playground is also a caldera wall, and that the green symmetrical mountain at the center of their world will, periodically, try to wash them into the sea.