The black lava sand is one of the characteristics of Bali. It makes the colour of these nudibranchs stand out too.

Why are the Balinese waters so rich?

It all starts east of the Philippines where the constant blowing of the tradewinds and the ocean currents forces huge masses of water up against the Philippines, where it is trapped and forced southwards. 

Most of this current is directed by ocean bottom morphology to flow into the Sulawesi basin and down between Borneo and Sulawesi—the fat red arrow on the figure above. The only thing sitting in this giant current’s way is the lesser Sunda Islands, predominantly Bali, Lombok, Sumbawa, Flores and Timor—with Bali sitting right in the ideal position to benefit from this flow.

A natural rock formation known as “Darwin’s Arch” protrudes from the water southeast of Darwin Island. The waters around the small, remote islands of Darwin and Wolf contain the largest biomass of sharks on the planet.

Largest shark biomass found in the Galápagos Islands

Overfishing has reduced biomass of most sharks and other large predatory fishes worldwide by over 90 percent, and even remote locations have been severely impacted. However, a few localities worldwide still maintain large abundances of top predatory fishes due to either being remote and unfished or having recovered after full protection from fishing.

Help protect the Coral Reefs

Our coral reefs are now under threat not only from the global warming, pollution and exploitation but also by the conduct of divers in these sensitive areas. The reefs are now calling for our protection both when we dive and as contributors to the ongoing struggle to preserve these unique ecosystems for future generations.