Guyana is located on the northern mainland of South America and is the only English-speaking country on the continent. Its capital, Georgetown, is situated on the Atlantic coast. About 87% of the country is covered by dense, pristine tropical rainforest, making it one of the most forested countries in the world. Its geography is divided into five regions: the coastal plain, the white sand belt, the interior highlands (including the Pakaraima Mountains), the hilly sand and clay region, and the interior savannas. Guyana is home to Kaieteur Falls, the world's largest single-drop waterfall by volume of water flowing over it. The country is part of the Guiana Shield, one of the oldest geological formations on Earth. In recent years, Guyana has become one of the world's fastest-growing economies due to massive offshore oil discoveries. It is culturally closer to the Caribbean than its South American neighbors.