Una Una Island Guide: Diving the Togean Volcano

Una Una is the volcano of the Togean Islands — a near-circular island formed by Gunung Colo, standing alone in deep water north of the main chain. Its 1983 eruption emptied the island of people; four decades on, the regrown slopes and nutrient-rich underwater flanks hold the densest fish life in the archipelago, headlined by schooling barracuda and jacks on the volcanic walls. Two dive resorts operate on the island: Sanctum Una Una and Pristine Paradise.

Last verified: June 2026.

The volcano story

Gunung Colo erupted in 1983 — the defining event in the island's modern history, per the public volcanological record: the island's population was evacuated and the eruption devastated its villages and coconut groves. People returned and rebuilt over the following decades; the volcano remains active and is monitored by PVMBG, Indonesia's volcanology agency — Colo's current alert level is published on the agency's official MAGMA Indonesia activity board, and your resort will know the practical reality on the ground. For travelers the legacy is twofold: black-sand-and-jungle scenery unlike the white-sand cays elsewhere in the Togeans, and volcanic nutrients that supercharge the surrounding reefs.

A guided hike toward the crater area is possible — ask at your resort; conditions and access vary with volcanic activity status.

The diving

This is why people come. Una Una rises from deep water, so its walls and slopes pull in fish that the inner-archipelago reefs do not:

• The schooling-fish sites — the signature dives: barracuda in their hundreds, big trevally, Napoleon wrasse on the walls and pinnacles the volcano built. On their day these are the best dives in the Togeans.
• The walls and slopes around the island — soft coral, sea fans, reef sharks cruising, with that big-blue volcanic backdrop.
• Conditions: 27-30°C water, mild-to-moderate currents at the fishier sites, with the clearest water in the April-November dry season.

Kadidiri-based dive centers also run Una Una day trips when numbers allow, but staying on the island means dawn boats and second chances at the barracuda school when it is shy.

Where to stay

Both are dive resorts first: good boats, dive-centric rhythms and largely wooden bungalows — though Sanctum has grown resort-style extras (infinity pool, gym, 24/7 solar power, Starlink), while Pristine runs generator power overnight with free Starlink wifi. Check each resort's current booking and payment terms when you reserve. Village homestays exist in Una Una village for the determined; verify locally.

Getting to Una Una

Una Una sits apart from the main chain, which keeps the crowds off and adds a leg to the journey:

• Via Wakai: take the daily speedboat from Ampana to Wakai (~1.5h, Rp 130,000-170,000 — see our Ampana boats guide), then your resort's pickup boat. Pristine Paradise publishes Wakai pickups at Rp 250,000 per person for divers / Rp 500,000 for non-divers (minimum 2).
• Public boat from Wakai: local boats run Wakai → Una Una on Sunday, Tuesday and Friday mornings (departing roughly 08:00-09:00, per Pristine Paradise's directions page) — the budget option if your dates line up. Schedules shift; confirm locally or with your resort.
• Direct private speedboat from Ampana: ~2 hours, from around Rp 3,500,000 for two — the time-rich-wallet option.
• From the Gorontalo side: a private speedboat from Marisa runs ~2.5 hours, around Rp 5,000,000 (max 6) — as of our last check; verify with your resort.

Coordinate everything by WhatsApp before leaving the mainland; signal on Una Una is minimal.

Beyond diving

Snorkeling off the resort reefs is genuinely good (volcanic-slope coral starts shallow), village walks are friendly, and the black-sand-and-coconut scenery makes for the moodiest sunsets in the Togeans. But pack books: Una Una is a one-activity island, and that activity is underwater.

FAQ

Is Una Una worth it if I don't dive?

Mostly no — the island's magic is underwater. Non-divers who snorkel well will still enjoy the reefs, but the white-sand beach experience is better at Malenge or Kadidiri.

When did the Una Una volcano last erupt?

Gunung Colo's last major eruption was in 1983 (per the public volcanological record), an event that forced the evacuation of the whole island. It remains an active, monitored volcano — check current activity status before planning crater hikes.

How do I get to Una Una?

Ampana → Wakai by daily speedboat, then either a resort pickup boat (Rp 250,000-500,000 pp) or the public boat that runs Wakai → Una Una on Sunday, Tuesday and Friday mornings. A direct private speedboat from Ampana (~2h, from ~Rp 3.5 million) skips Wakai entirely. Boats to Una Una do not run daily, so arrange everything in advance.

Which resort should I choose, Sanctum or Pristine Paradise?

Both are well-run dive resorts. Sanctum is the best-reviewed dive operation in the archipelago and has added resort comforts (pool, gym, 24/7 solar, Starlink), with rooms priced per night and meals optional; Pristine Paradise publishes simple per-person full-board prices from Rp 300,000 up to family/VIP bungalows. Divers booking packages should compare both.

Can you climb the volcano?

Guided walks toward the crater area are possible when activity status allows — arrange at your resort and treat any summit ambitions as conditions-dependent.