Although not a dive, Palau’s Jellyfish Lake is a natural phenomenon and a must-do. The land-locked saltwater lake contains two species of jellyfish that have evolved away from their stingers in the absence of predators. Snorkelers can swim among thousands of pulsating jellyfish without the worry of any pain. Special guidelines are required for snorkeling and swimming in Jellyfish Lake. No scuba diving is permitted. 
UPDATE on Jelly Fish lake (December 2022): Due to the exceptional weather conditions, the Golden Jellyfish population has seriously decreased since October 2021, as explained on the Palau Visitors Authority website. We will follow closely and keep you posted on a regular basis. Despite this, we will continue to offer the Jelly Fish lake snorkeling experience during our trips, as many Moon jellyfish can be still seen.