the world. The territory it controls lies between latitudes 0° and 16°N and longitudes 59° and 74°W. Shaped roughly like a triangle, the country has a coastline in the north, which includes numerous islands in the Caribbean and the northeast borders the northern Atlantic Ocean. Most observers describe Venezuela in terms of four fairly well defined topographical regions: the Maracaibo lowlands in the northwest, the northern mountains extending in a broad east–west arc from the Colombian border along the northern Caribbean coast, the wide plains in central Venezuela, and the Guiana Highlands in the southeast. The northern mountains are the extreme northeastern extensions of South America's Andes mountain range. Pico Bolívar, the nation's highest point at , lies in this region. To the south, the dissected Guiana Highlands contain the northern fringes of the Amazon Basin and Angel Falls, the world's highest waterfall, as well as tepuis, large table-like mountains. The country's center is characterized by the llanos, which are extensive plains that stretch from the Colombian border in the far west to the Orinoco River delta in the east. The Orinoco, with its rich alluvial soils, binds the largest and most important river system of the country; it originates in one of the largest watersheds in Latin America. The Caroní and the Apure are other major rivers. Venezuela borders Colombia to the west, Guyana to the east, and Brazil to the south. Caribbean islands such as Trinidad and Tobago, Grenada, Curaçao, Aruba, and the Leeward Antilles lie near the Venezuelan coast. Venezuela has territorial disputes with Guyana, formerly United Kingdom, largely concerning the Essequibo area and with Colombia concerning the Gulf of Venezuela. In 1895, after years of diplomatic attempts to solve the border dispute, the dispute over the Essequibo River border flared up. It was submitted to a "neutral" commission (composed of British, American, and Russian representatives and without a direct Venezuelan representative), which in 1899 decided mostly against Venezuela's claim. Climate Venezuela is entirely located in the tropics over the Equator to around 12° N. Its climate varies from humid low-elevation plains, where average annual temperatures range as high as , to glaciers and highlands (the páramos) with an average yearly temperature of . Annual rainfall varies from in the semiarid portions of the northwest to over in the Orinoco Delta of the far east and the Amazonian Jungle in the south. The precipitation level is lower