Cenote Calavera, also known as "Skull Cenote", is a sinkhole located in the Yucatan Peninsula, Mexico. It is named after its distinctive shape, which resembles a human skull. Cenote Calavera is a popular tourist destination and is known for its stunning turquoise waters and underwater caves, which are home to an array of marine life and make it a popular spot for snorkeling and scuba diving.

The sinkhole is about 60 feet wide and approximately 30 feet deep, and its unique formation is a result of the collapse of the limestone roof over a subterranean river. Visitors can take a dive into the crystal clear waters to explore the caves and see the diverse marine life, including fish, turtles, and a variety of other aquatic creatures.

Visitors should be aware that Cenote Calavera is not a lifeguarded swim area, and swimming is at one's own risk. It is also recommended to bring insect repellent, as the area can be prone to mosquitoes.