Port Resolution, Tanna, Vanuatu tide times

Tanna Island lies in the southern Vanuatu group, 210 km south of Efate, accessible by 45-minute Air Vanuatu turboprop from Port Vila or by the Vanuatu ferry network. The island is primarily known internationally for Mount Yasur — the most accessible active volcano on Earth and one of the world's most continuously active. The summit crater is 5 to 15 minutes of eruptions per hour, every hour, every day, and the approach from the ash plain is a 20-minute 4WD drive followed by a 15-minute walk to the crater rim.

Mount Yasur sits at the southeastern corner of Tanna, a small basaltic stratovolcano rising to 361 m above the ash plain. The eruptions are strombolian: lava bombs, volcanic gas, and incandescent ejecta thrown 50 to 200 m from the crater with a ground-vibrating concussive sound. At activity level 1 (normal background), the ejecta lands inside the crater and observers at the rim are at low risk from falling material. At level 2, occasional fragments cross the rim and observers need to stay alert. At level 3, the approach track closes. The Vanuatu Geohazards Observatory posts real-time activity levels on its website; checking before the drive to the ash plain is essential. Hard hats are provided by tour operators at the rim.

Port Resolution Bay on the southeastern coast is where Captain James Cook anchored on 5 August 1774 during his second Pacific voyage — one of the earliest European records of Tanna. The bay is protected enough to serve as an anchorage for yachts visiting Tanna, with a sand bottom and holding ground on the eastern side. The Imayo thermal hot springs emerge on the tidal flat at the bay's inner end, accessible by wading at low water: the spring vents produce warm (35 to 50°C) water that mixes with the bay water, and the local children swim in the thermal zone on the falling tide when the temperature is most concentrated. The spring range of 1.0 to 1.5 m at Tanna means the thermal flat is exposed for 1 to 2 hours around the spring low.

The John Frum cargo cult movement, which emerged on Tanna in the 1930s, centres on a messianic figure expected to return bringing material abundance. The movement's ceremonial focus is Sulphur Bay village near the volcano; the John Frum ceremonies (every Friday evening) are attended by the community and observable by visitors who arrive with appropriate guidance. The traditional kastom villages of Tanna's interior — including Yakel village near the volcano — maintain customary dress and cultural practices; guided visits are the standard access route. Pacific semidiurnal, spring range 1.0 to 1.5 m. Predictions on this page come from Open-Meteo Marine (gridded model, ±45 min / ±0.2–0.3 m). The Tanna Coffee Cooperative in the island's interior produces organic shade-grown coffee; the volcanic soil of the Tanna plateau is one of the better coffee-growing environments in the Pacific. Tours of the cooperative and roasting facility are available through Tanna's tour operators. Tanna coffee is sold in Port Vila shops and at the cooperative; buying from the cooperative directly maximises the grower share. The volcano of Mount Yasur is the centrepiece of Tanna tourism; it erupts continuously with Strombolian-style explosions and is accessible on foot to the crater rim, where visitors stand within 100 m of active lava bombs. Volcano visits are unrelated to tidal state but are weather-dependent in terms of visibility; evening visits in clear conditions show the lava glow best. The coast at White Grass, the main gateway area near the airport, has a fringing reef with a narrow lagoon. Snorkelling inside the lagoon requires water level above 0.5 m to access the outer bommies without grounding; the incoming flood is the correct window. The Lenakel waterfront, Tanna's main town and port, handles inter-island shipping; the wharf has enough depth for cargo ships at most tidal states. Kayaking from White Grass toward the southern coast is a half-day trip that should be timed to depart on the morning flood and return on the afternoon sea breeze — current and wind roughly opposing each other on the return leg makes paddling manageable.