An archipelago of over 500 little islands, including 200 that are volcanic, Palau is a gem in the Pacific Ocean. It is a true-blue diver’s paradise, offering unique dive sites such as the Blue Corner, German Channel, and Ulong Channel. Between February and April every year, hundreds of grey reef sharks swim to the waters of Palau for mating season. This is when the destination hosts Shark Week Palau. Its 20th annual edition is set to take place from February 27 to March 6, 2022; experienced divers can take part in citizen science activities such as keeping a tab on the number of shark species, from grey reef and blacktip to blue, tiger, and hammerhead. Or sign up for a snorkelling tour of the UNESCO World Heritage–listed Rock Islands Southern Lagoon with the Oceanic Society in February or November.