Bligh Water is the stretch of sea that separates Fiji's 2 main islands of Vanua Levu and Viti Levu, and was named after the famous Captain Bligh of The Bounty. There's a vast amount of water moving through this channel and this means incredibly nutrient-rich waters, especially where the channel narrows. This local bounty feeds huge numbers of smaller fishes, which in turn feed the larger fish. Visit the Bligh Waters to watch this extraordinary interplay of ecosystems.
This is really the domain of Fiji liveaboards. Most dive safaris tour the Wakaya, Gau, Koro, and Namena Islands to visit the underwater of Bligh Water. Although it is the domain of the Fijian liveaboards, alternatively you can dive some of the Bligh Water dive sites near RakiRaki while staying at Volivoli, in northern Viti Levu.
Due to the strong currents, not all the sites in Bligh Water and the Koro Sea are particularly suitable for beginners, but the reefs are now the modern playground of experienced divers, particularly photographers, seeking pristine conditions and uncrowded dive sites.
Koro island has a unique location with currents from the Koro Sea feeding its reefs and providing amazing visibility in crystal clear water. You can expect to see large numbers of fish, from small to very large!
For those chasing the big boys, Koro Island's Shark Fin Point is probably the best bet. Whale sharks have even been spotted around Koro Island but such sightings are rare.