The Pacific waters off of Guanacaste in northern Costa Rica are well known for their encounters with large schools of cow-nose or eagle rays and horse-eye jacks. Bull sharks can be found at Cat and Bat Islands. These cooler, nutrient-rich waters also bring in pelagics, including mantas, spinner dolphins, humpback whales, pilot whales, and whale sharks. Further south near Costa Rica’s border with Panama, Corcovado and Coiba National Parks offer pristine diving. However, access here is limited to a few operators and liveaboards with the main attraction of this southern dive region being schooling hammerheads.