Oceania’s highest peaks are concentrated almost entirely on the island of New Guinea, where a cluster of glacier-capped summits in the Sudirman Range towers well above anything found on Australia, New Zealand, or the Pacific Islands. Which peak actually claims the title of “highest in Oceania” depends on how you define the region’s boundaries—a genuinely debated question that shapes this entire list.
1. Puncak Jaya (Carstensz Pyramid) — 4,884 meters (16,024 feet)
Puncak Jaya, also known as Carstensz Pyramid, is the highest mountain peak of an island on Earth, and the highest peak in Indonesia and within Oceania when the Indonesian half of New Guinea is counted as part of the region. Located in the Sudirman Range of Central Papua, it’s ranked 5th in the world by topographic isolation and is included in the “Eight Summits” mountaineering list precisely because of the ongoing debate over whether it or Australia’s Mount Kosciuszko represents the true Oceania summit. By 2025, more than 99 percent of the mountain’s glaciers had melted due to climate change, a dramatic change for a peak that once carried permanent ice near the equator.
2. Sumantri — 4,870 meters (15,978 feet)
Sumantri sits just about 2 kilometers northeast of Puncak Jaya and belongs to the same Sudirman Range. It was first summited in February 1962, and its southern slopes once featured the remnants of the Northwall Firn, a glacier that has since dramatically shrunk. Because Sumantri is considered a sub-peak of Puncak Jaya rather than a fully independent mountain, it typically isn’t counted separately in official rankings, even though its elevation would otherwise place it second on this list.
3. Carstensz East — 4,808 meters (15,810 feet)
Regarded as New Guinea’s fourth-highest point by elevation, Carstensz East is another sub-peak of the Puncak Jaya massif, distinguished by a small glacier that is rapidly retreating. Like Sumantri, its classification as a sub-peak rather than an independent summit affects where it lands in official Oceania rankings.
4. Puncak Mandala — 4,760 meters (15,617 feet)
Located on the Indonesian side of the island and belonging to the Jayawijaya Range, Puncak Mandala is recognized as an independent mountain and is typically counted as New Guinea’s second-tallest true peak. It once carried a permanent ice cap, but that ice disappeared completely by 2003, mirroring the broader glacial retreat seen across the island’s highest summits.
5. Puncak Trikora — Approximately 4,750 meters (15,584 feet)
Puncak Trikora rounds out the small group of genuinely independent (non-sub-peak) summits on New Guinea, ranking as the island’s third-tallest true mountain. Like its neighbors, it sits within the broader Jayawijaya highland system that runs through the center of the island.
6. Ngga Pilimsit — Elevation Varies by Definition
Depending on the definition used for what counts as an independent mountain, Ngga Pilimsit ranks anywhere from the fourth to seventh highest peak on New Guinea. It once held a small cirque glacier on its eastern slope, but the ice was last observed in 1988 and had completely disappeared by 1991, with the disappearance formally confirmed by satellite imagery in 2003.
7. Mount Wilhelm — 4,509 meters (14,793 feet)
Mount Wilhelm is the highest peak entirely within Papua New Guinea, located in Madang province, and is often the peak cited as “highest in Oceania” by those who don’t count Indonesia’s portion of New Guinea within the region, since Indonesia straddles both Asia and Oceania geographically. Unlike the technical climbs required for Puncak Jaya, the ascent of Wilhelm is non-technical, typically taking three to four days, and has become an increasingly popular trekking destination thanks to targeted tourism campaigns.
8. Mount Giluwe — Approximately 4,368 meters (14,331 feet)
Located in Papua New Guinea’s Southern Highlands, Mount Giluwe is a massive shield volcano and is recognized as the highest volcanic peak in Oceania, distinguishing it from the largely non-volcanic Sudirman Range summits that dominate the top of this list.
9. Aoraki / Mount Cook — 3,724 meters (12,218 feet)
New Zealand’s tallest peak, Aoraki/Mount Cook, sits in the Southern Alps of the South Island and is the highest point in the country. While dramatically shorter than New Guinea’s glacial summits, it remains one of the most iconic and frequently climbed peaks in the entire Oceania region, holding deep cultural significance to Māori tradition.
10. Mount Kosciuszko — 2,228 meters (7,310 feet)
Mount Kosciuszko is the highest peak on the Australian mainland, and for climbers pursuing the traditional “Seven Summits” challenge without counting New Guinea, it’s the peak that represents Oceania on that list. Its modest elevation compared to the New Guinea giants is part of why the entire “highest in Oceania” debate exists in the first place—Kosciuszko is a relatively easy, non-technical hike, a stark contrast to the ice and rock climbing required on Puncak Jaya.
Why the Rankings Get Debated
The core issue behind this list is that Oceania’s geographic boundaries aren’t universally agreed upon. If the Indonesian half of New Guinea is counted as part of Oceania, Puncak Jaya is decisively the region’s highest peak by a wide margin. But because Indonesia is generally classified as an Asian nation, some Seven Summits lists substitute Mount Kosciuszko or Mount Wilhelm instead, since those peaks sit within countries unambiguously considered part of Oceania. There’s no single official resolution to this debate, and different mountaineering and geographic authorities continue to apply different definitions.
Join The Discussion
Do you consider Puncak Jaya part of Oceania’s highest peaks, or do you side with the view that Mount Kosciuszko or Mount Wilhelm better represents the region? Have you climbed any of these peaks, and how did the experience compare across such different terrain and difficulty levels? Share your thoughts, experiences, or questions about Oceania’s mountains below.
