Snorkeling is a popular activity that involves swimming and diving with a snorkel mask and tube to observe underwater life. The three locations for snorkeling are a REEF, LAGOON, and coral REEF. A REEF is a rocky area of the ocean floor that is home to many different species of fish and other marine life. A LAGOON is a shallow body of water surrounded by land, often with a sandy bottom and coral reefs. A coral REEF is an underwater ecosystem made up of colonies of coral polyps and other organisms. These reefs provide a habitat for a variety of marine life and are popular destinations for snorkelers.