
Marovo Lagoon
Also known as: world's largest saltwater lagoon
Vast double-barrier lagoon with passage drift dives and reef sharks
The encounter
Species / spectacle: Over 2,000 reef fish species, extensive hard and soft coral, grey reef sharks, rays, turtles and dolphins; drift channels concentrate the fish life.
How you see it: dive/snorkel
Typical duration: Typical reef or drift dive of 40-60 min; snorkel sessions similarly flexible. (Confirm.)
When to go
Year-round diving with generally calmer, clearer conditions in the drier months. (Confirm.)
Reef and shark encounters are reliable year-round; no published month-by-month index. (Confirm.)
Best time of day: Drift and channel dives are timed to tidal flow rather than a fixed hour. (Confirm.)
Hammerheads are reported in the wider Marovo-Uepi area in the cooler mid-year months. (Confirm.)
Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.
Who it suits
Difficulty (1-5): 3 (moderate)
Physical demand: Inner-lagoon reefs are calm and low-effort, while outer-reef and channel drifts add current that demands drift-dive competence. Wide range suits mixed abilities.
Accessibility & group fit: Broad appeal from snorkellers and beginners on sheltered reefs to experienced divers on the drifts. Family and mixed-ability friendly overall.
Options for a mixed group: Sites can be chosen to split calm-reef groups from drift groups; resorts and liveaboards tailor by ability. (Confirm.)
Permits & responsible travel
Regulation / permits / fees: Custom or reef fees of roughly US five dollars per person per dive are typically paid to the owning village or chief; each lagoon area has its own owners.
Guide / crew: Local guiding via resorts or liveaboards is strongly recommended, especially for drift and passage dives.
About 80 percent of Solomon Islands land and reef is under customary tenure, so reef-owner permission is essential and fees support community-run marine protected areas. Choose locally owned operators.
Permits, fees and quotas change - confirm before booking.
Safety & hazards
Strong tidal currents in passages, boat traffic in channels and post-rain visibility loss are the main concerns.
Weather / conditions: Lagoon is largely sheltered, but outer reefs and passages are exposed to wind, swell and strong tidal current. Visibility can drop after heavy rain.
Remote region with limited medical infrastructure; operators carry oxygen and serious cases route toward Honiara. (Confirm.)
Getting there & staying
Access logistics: Fly Honiara to Seghe (about one hour) or Munda, then transfer by boat into the lagoon; travel times vary by destination within the lagoon.
Accommodation / camping: Range of options from Uepi Island Resort and community-run eco-lodges to liveaboards; village homestays exist in places. (Confirm.)
Gear / water / connectivity: Gear and fills available through resorts and liveaboards; connectivity is limited and patchy across the remote lagoon. (Confirm.)
Facilities: Resort and village facilities exist at hubs like Seghe and Uepi; remote sites have none. (Confirm.)
Crowds / solitude: Generally uncrowded with a strong sense of solitude away from the few resorts and dive boats.
Operators & guiding
Nearby operators / hubs: Seghe is the main gateway; Uepi Island Resort and Honiara-based liveaboards operate throughout the lagoon.
Guided trips / outfitters: Uepi Island Resort and liveaboards such as Bilikiki Cruises run diving in the lagoon. (Confirm.)
Operators change - confirm current licensing before you book.
Live conditions & sources
Recent sightings and today's conditions are a runtime layer - check the sources: https://www.uepi.com/ ; https://en.wikipedia.org/wiki/Marovo_Lagoon ; https://www.noonsite.com/place/solomon-islands/western-province-new-georgia/marovo-lagoon/ - referenced under fair use.
This profile is desk research, compiled from public sources - not a first-hand wildlife report. Coordinates are approximate.

