Plizio Visual Lab
Kao
Plizio editorial teamData Sources
Mountain
Weather…
Water temperature…
Kao is an uninhabited volcanic island in the Ha'apai archipelago and home to the highest peak in the Kingdom of Tonga. The stratovolcano rises from the Pacific with exceptional symmetry, reaching an elevation of 1,030 meters. Geologically, Kao is an extinct or dormant volcano, its slopes covered with dense tropical rainforests and ferns. The summit is frequently shrouded in clouds, contributing to a unique microclimate. The island is separated from the neighboring volcanic island of Tofua by a narrow, 5-kilometer-wide strait. Due to its extremely steep flanks and the absence of natural harbors, climbing Kao is a significant physical challenge and is rarely attempted. Its pristine nature makes Kao an important site for the preservation of Tonga's native flora and fauna, free from human interference.
- Location: Tonga
- Nearby: Koulo (76 km)
Best time to visit & climate
The most pleasant time to visit is Jul–Sep.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 27 | 27 | 27 | 27 | 26 | 25 | 24 | 24 | 24 | 25 | 25 | 26 |
| Rain mm | 216 | 203 | 191 | 174 | 112 | 111 | 59 | 69 | 79 | 104 | 115 | 144 |
📋 Practical info
Getting there
Kao is located north of Tofua and is accessible only by private boat charter from Pangai in the Ha'apai islands. There is no beach; landings are made directly onto volcanic rocks.
Best season
Plan your visit for the dry season (May-October) for the most stable sea and weather conditions. Heavy swells can make landing on the rocky shore impossible during other months.
Terrain & paths
The island is a single, steep volcanic cone covered in thick rainforest. The terrain is exceptionally demanding with loose volcanic soil and dense tropical vegetation.
What to bring
Essential items include professional-grade hiking boots, camping gear, a machete, and several days' worth of food and fresh water, as no water is available on the island.
Parking
Parking is available at the harbour in Pangai. Check with your boat operator about where to safely leave your vehicle during your multi-day expedition to Kao.
Safety
This uninhabited island is extremely remote. There is a high risk of injury on the steep, pathless slopes; rescue operations are difficult and slow in this part of Tonga.
Time needed
A minimum of 2 days is required for a serious attempt at the mountain. This includes boat travel and a very strenuous climb through the dense forest towards the cone's peak.
Geography
Facts
- The summit of Kao stands at 1,030 meters above sea level.
- Kao is located at 19.67° south latitude and 175.02° west longitude.
- The island covers an area of approximately 11.6 square kilometers.
- Captain James Cook sighted the island of Kao in 1774.
- The slope of the volcanic flanks exceeds 35 degrees in some places.
- Kao and Tofua together form a geologically closely linked volcanic system.
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
Vehicle
Only stops with (optional):
© OpenStreetMap contributors · OpenRouteService
Sights in the town Kao (1)
Sights nearby
Frequently asked questions
How difficult is climbing Kao?
The climb is very challenging, steep, and requires an experienced guide.
How long does the tour to the peak take?
Plan for a full day for the ascent and descent.
Is there drinking water on Kao?
No, there are no springs, you must bring all water yourself.
Is the mountain volcanically active?
Kao is a dormant stratovolcano but is currently considered inactive.
Do you need a permit?
It is recommended to inquire with local authorities about access before starting.
Kao: where is it located?
Kao is located in Tonga.
Kao: when is the best time to visit?
The most pleasant time to visit is Jul, Sep.
Kao: why is it worth visiting?
Kao is an uninhabited volcanic island in the Ha'apai archipelago and home to the highest peak in the Kingdom of Tonga.
Explore with Plizio
Discover more places in Oceania
More places in Tonga →
Nearby cities
Nuku'alofa Waterfront Commercial Zone
The redeveloped waterfront area of Nuku'alofa is a hub for retail, tourism, and dining.
Nukuʻalofa
Nukuʻalofa is the capital and economic hub of Tonga, located on the northern coast of Tongatapu island.
Digicel Square
This commercial area in central Nuku'alofa houses the main office of the private mobile operator.
Neiafu
Neiafu is the second largest town in Tonga and the administrative center of the Vavaʻu island group.
Faleloa
Faleloa is the largest village on Foa island within the Haʻapai group.
Fangaleʻounga
Fangaleʻounga is a small coastal village situated on the island of Haʻano.
Pangai
Pangai is the administrative center of the Haʻapai island group, located on Lifuka island.
Kolonga
Kolonga is a historical village located in the northeastern part of Tongatapu island.
Talafoʻou
Talafoʻou is a village in northeastern Tongatapu, recognized for its coastal fishing community.
Hihifo
Hihifo is a major settlement on Lifuka island within the Haʻapai archipelago.
🗺️
Navutoka
Navutoka is a coastal village in northeastern Tongatapu, immediately west of Talafoʻou.
🗺️
Longomapu
Longomapu is a scenic village in western Vavaʻu, located near Lake Ano.
Kolovai
Kolovai is a village in western Tongatapu, famous for its colony of fruit bats (flying foxes).
🗺️
Tefisi
Tefisi is a hilltop village on Vavaʻu island, known for its scenic overlooks.
Foʻui
Foʻui is a significant village on Tongatapu, situated along the main road to Nukuʻalofa.
History & landmarks
Nature
Kao Island
Kao is the highest point in Tonga and is an extinct volcanic cone.
Tofua Volcano
Tofua is an active volcanic island featuring a large central caldera.
🗺️
Tofua Island Nature Reserve
An active volcanic island with a caldera lake, under protection due to its undisturbed ecosystems.
🗺️
Ha'apai Marine Protected Area
Encompasses numerous reefs and uninhabited islands to preserve the biodiversity of the central island group.
Nomuka Blue Lagoon
A brackish inland water body on Nomuka Island, hosting a unique flora and fauna.
Nomuka Lake
Nomuka Lake is a large brackish lake in the center of Nomuka Island.
Vava'u Whale Sanctuary
A marine area welcoming humpback whales annually from Antarctica to calve in the warm waters.
'Uiha Island
'Uiha is a low-lying coral island in the Ha'apai group.
More places
Kao Island Forest
The island hosts Tonga's highest peak and is almost entirely covered by dense, pristine tropical rainforest.
Tofua
Tofua is a circular volcanic island featuring a broad central caldera.
Ha'afeva Historic Pier
A historic landing spot in Ha'apai that has been a gateway to the outside world since the colonial era.
🗺️
Lateiki
Lateiki, formerly known as Metis Shoal, is an active submarine volcano.
🗺️
'Uiha Royal Tombs
Ancient burial grounds on the sacred island of 'Uiha, serving as the resting place for important local chiefs.
Ha'apai High School
Ha'apai High School is a major educational center on Lifuka island and a prominent building in the region.
Pangai Port
Pangai Port is the vital supply artery for the Ha'apai islands.