Regla is one of the 15 municipalities or boroughs situated within the city of Havana, Cuba. It encompasses several distinct areas, including the town of Regla and the village of Casablanca.
The town of Regla is located at the bottom of Havana Bay in a site formerly known as the aborigine settlement of Guaicanamar. The municipality also includes Loma Modelo, which sits on a peninsula that divides the Marimelena and Guasabacoa inlets. The village of Casablanca is positioned at the entrance of Havana Bay.