Theater of the Sea, Marine park with animal shows in Islamorada, United States

Theater of the Sea is a marine mammal park on Windley Key in Islamorada, Florida, opened in 1946. Its grounds occupy a former quarry that supplied rock for Henry Flagler's Overseas Railroad. Dolphins, sea lions, sea turtles, sharks, stingrays and alligators are kept in saltwater lagoons on the site.

The park opened in 1946 within a site that had been mined for rock in earlier decades. This conversion of an old industrial excavation into a marine education facility marked the beginning of what it is today.

The place takes its name from the idea that the sea itself is a theater of nature where visitors watch animals in their waters. Daily shows with dolphins and sea lions demonstrate how these creatures behave in settings that resemble their natural habitats.

The park opens daily and welcomes visitors to observe animals from multiple angles, with opportunities to enter the lagoons for swimming. Guests should wear comfortable clothing and prepare for sunny weather with limited shade, as the facility is mostly outdoors.

Visitors can observe dolphins and other sea creatures in lagoons that reach up to 20 feet (6 meters) deep, mimicking open-water activities. This depth allows the animals to perform natural swimming behaviors in ways that set this place apart.