Guyana South American nation in which English is the official language. The majority of the population, however, speak Guyanese Creole, an English-based creole language, as a first language. Guyana is part of the Anglophone Caribbean. CARICOM, of which Guyana is a member, is headquartered in Guyana's capital and largest city, Georgetown. In 2008, the country joined the Union of South American Nations as a founding member. The name "Guyana" derives from "Guiana", the original name for the region that formerly included Guyana (British Guiana), Suriname (Dutch Guiana), French Guiana, and parts of Colombia, Venezuela and Brazil. According to the "Oxford English
Suriname the Atlantic coast. The southernmost borders with French Guiana and Guyana are disputed by these countries along the Marowijne and Corantijn rivers, respectively, while a part of the disputed maritime boundary with Guyana was arbitrated by a tribunal convened under the rules set out in of the United Nations Convention on the Law of the Sea on 20 September 2007. Lying 2 to 5 degrees north of the equator, Suriname has a very hot and wet tropical climate, and temperatures do not vary much throughout the year. Average relative humidity is between 80% and 90%. Its average temperature ranges from