Guyana (full name is Republic of Guyana) is a tropical country situated on the northern coast of South America. It is the only country in South America where English is the official language.It is bordered by Venezuela on the west, Suriname on the east, Brazil on the south and the Atlantic Ocean on the north.uyana (full name is Republic of Guyana) is a tropical country situated on the northern coast of South America. It is the only country in South America where English is the official language.