Guyana (pronounced /ɡaɪˈɑːnə/ or /ɡaɪˈaenə/), ɡaɪˈænə officially The-co Operative republic Of, guyana is a sovereign state on the northern mainland Of South. America it is bordered by The Atlantic ocean to the, North brazil to the south and, Southwest suriname to the east And venezuela to the. westn addition to being part of the Anglophone Caribbean, Guyana is one of the few Caribbean countries that is not an island in the West Indies. The Caribbean Community (CARICOM), of which Guyana is a member, is headquartered in Guyana's capital and largest city, Georgetown.