Swim alongside the largest fish in the ocean in the calm waters of Saleh Bay, Sumbawa — a wild, ethical encounter on the natural cruise route, not a theme-park show.
Whale sharks gather around traditional bagan fishing platforms in Saleh Bay. Encounters are not guaranteed, but most cruises sailing from April to June report sightings.
This experience happens during natural cruise transit through Saleh Bay, between Sumbawa and Flores, where whale sharks feed near traditional bagan platforms. There is no commercial baiting and no guaranteed show.
It is a genuine wild encounter — which is exactly what makes it memorable.
Adults measure 10 to 15 metres, with the largest recorded near 18.8 metres and weights of 20 to 40 tons. Despite their size they are gentle filter feeders, sieving fish eggs and crustacean larvae through throats only about five centimetres wide.
They cruise steadily at the surface and are generally indifferent to the people around them.
The season runs March to September, with April to June the optimal window. In those months sighting rates run around 70–80%, dropping to roughly 40–50% from July to September.
Calm morning conditions in the bay give the clearest, easiest encounters.
Boats approach parallel to the shark’s path and cut engines beyond 30 metres. Snorkellers enter the water at least 10 metres ahead so the animal passes naturally, and each encounter is limited to a maximum of 30 minutes.
Flash photography, touching, feeding and baiting are all prohibited — by law and by ethics.
A portion of every cruise booking supports local marine conservation in Saleh Bay, including whale shark photo-ID research that tracks individual animals over time.
Choosing an ethical operator directly funds the long-term protection of this population.
A wild whale shark encounter on the cruise route.
Gentle filter feeders up to 15 metres long.
Sheltered Saleh Bay makes for easy, relaxed swimming.
No baiting, strict approach rules and time limits.
Around 70–80% sighting rates from April to June.
Still unsure? Our Lombok team answers every question personally — usually within 2 hours on WhatsApp.
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Travel in the April–June window for the best odds. Send your dates and we’ll build Saleh Bay into your cruise.
