The Caves of Drach (modern Catalan spelling: Coves del Drac [ˈkɔβəz ðəl ˈdɾak]; Spanish: Cuevas del Drach; lit. 'Dragon caves') are four great caves that are located in the island of Majorca, Balearic Islands, Spain,[1] extending to a depth of 25 m and reaching approximately 4 km in length.[1] They are in the municipality of Manacor, near the locality of Porto Cristo. They were first mentioned in a letter dated 1338.[citation needed] The four caves, called Black Cave, White Cave, Cave of Luis Salvador, and Cave of the French, are connected to each other.