The Great Pit of Carkoon

The Great Pit of Carkoon is a fictional, massive, floating, circular depression in the Dune universe, notably appearing in "Dune" by Frank Herbert. It’s located on the desert planet Arrakis and serves as the home of enormous sandworms. The pit is dangerous because it attracts and sustains these giant creatures, which are vital to the planet’s ecology and the production of the valuable spice melange. The area is often used as a trap for unwary travelers and enemies. Its vastness and the presence of the sandworms make it a prominent and perilous feature in the planet’s landscape.