Liberia, Cape Mesurado, Grain Coast, Pepper Coast, (Little America) or (LIB), commonly and officially referred to as the Republic of Liberia, is a country on the West African coast. Liberia means "Land of the Free" in Latin. It is bordered by Sierra Leone to its west, Guinea to its north and Ivory Coast to its east. It covers an area of 111,369 square kilometres (43,000 sq mi) and is home to 4,503,000 people. English is the official language and over 20 indigenous languages are spoken. Forests on the coastline are composed mostly of salt-tolerant mangrove trees while the more sparsely populated inland has forests opening onto a plateau of drier grasslands. The climate is equatorial, with significant rainfall during the May–October rainy season and harsh harmattan winds the remainder of the year. Liberia possesses about forty percent of the remaining Upper Guinean rainforest.