Nicaragua (American English: , British English: ), officially the Republic of Nicaragua ( ), is the largest country in the Central American isthmus, bordering Honduras to the north and Costa Rica to the south. The country is situated between 11 and 14 degrees north of the Equator in the Northern Hemisphere, which places it entirely within the tropics. The Pacific Ocean lies to the west, and the Caribbean Sea to the east. The country’s physical geography divides it into three major zones: Pacific lowlands; wet, cooler central highlands; and the Caribbean lowlands. On the Pacific side of the country are the two largest fresh water lakes in Central America—Lake Managua and Lake Nicaragua. Surrounding these lakes and extending to their northwest along the rift valley of the Gulf of Fonseca are fertile lowland plains, with soil highly enriched by ash from nearby volcanoes of the central highlands. Nicaragua’s abundance of biologically significant and unique ecosystems contribute to Mesoamerica’s designation as a biodiversity hotspot. The Spanish Empire conquered the region in the 16th century. Nicaragua achieved its independence from Spain in 1821. Since its independence, Nicaragua has undergone periods of political unrest, dictatorship, and fiscal crisis—the most notable causes that led to the Nicaraguan Revolution of the 1960s and 1970s. Nicaragua is a representative democratic republic, and has experienced economic growth and political stability in recent years. Since 2007, Daniel Ortega has been the president. The population of Nicaragua, approximately 6 million, is multiethnic. Its capital, Managua, is the third-largest city in Central America. Segments of the population include indigenous native tribes from the Mosquito Coast, Europeans, Africans, Asians, and people of Middle Eastern origin. The main language is Spanish, although native tribes on the eastern coast speak their native languages, such as Miskito, Sumo, and Rama, as well as English creole. The mixture of cultural traditions has generated substantial diversity in art and literature, particularly the latter given the various literary contributions of Nicaraguan poets and writers, including Rubén Darío, Pablo Antonio Cuadra and Ernesto Cardenal. The biological diversity, warm tropical climate, and active volcanoes make Nicaragua an increasingly popular tourist destination.