Snorkelers' spots are typically found near reefs, which are underwater structures composed of coral, rocks, and sand. These structures provide a habitat for a variety of marine life, making them popular destinations for snorkelers. Reefs can be found in many different parts of the world, from tropical to temperate climates. Snorkeling around reefs is a great way to observe the vibrant colors and diverse species of fish and other sea creatures that inhabit them.