The mountain range of the Sierra del Rosario is a Biosphere Reserve west of Havana. Hills up 700 m of height are densly covered with tropical forests and numerous endemic flora and fauna. Until the beginning of the 20th century the humid hillsides were several coffee plantations founded by french settlers who had been driven from other carribean sites such as Haiti. These plantatations are abandonded now. Rum, sugar cane and tobacco promised more profit. The ruins of the plantations include the poor dwellings of slaves.