Isla Boca Brava is located off the Pacific coast of Panama in the Gulf of Chiriquí, specifically in the Bahia de Muertos which is a coral reef. It is about one-half mile from the small mainland village of Boca Chica. Boca Brava connects to Isla Palenque by way of a narrow land bridge.
Wikivoyage has a travel guide for Boca Brava.