Swimming with whale sharks at Cancun is the experience of a lifetime. Join a whale shark watching or snorkeling tour from our comfortable boats and experience the ultimate wildlife encounter. Every year, between first June to late August, these gentle giants of the ocean congregate in the Mexican Caribbean Sea following the mass spawning of coral and plankton . Harmless to humans, they are the world’s largest species of fish and can grow up to 18 metres in length. The opportunity to swim with whale sharks at Cancun region attracts visitors from very far . It’s one of very few regions in the world where they congregate r in pelagic waters and are easily accessible for whale shark tours..