Both islands are mountainous, with peaks up to 1,300 m (4,300 ft) rising abruptly from the shore, and covered with tropical forests. Heavy rains (up to 304 cm or 120 inches annually) fall on the windward (southeastern) side, covering these sections of the islands with dense tropical forest. Lowlands on the western portions of each of the main islands are sheltered by the mountains and have a well-marked dry season favorable to crops such as sugarcane.