Guyana can be divided into five natural regions;
• a narrow and fertile marshy plain along the Atlantic coast (low coastal plain) where most of the population lives;
• a white sand belt more inland (hilly sand and clay region), containing most of Guyana's mineral deposits;
• the dense rainforests (Forested Highland Region) in the middle of the country;
• the grassy savannahs in the southern west;
• the larger interior highlands (interior savannah) consisting mostly of mountains that gradually rise to the Brazilian border.
Guyana has one of the largest unspoiled rainforests in South America, some parts of which are almost inaccessible by humans. More than 80% of Guyana is still covered by these forests, ranging from dry evergreen and seasonal forests to montane and lowland evergreen rain forests. These forests are home to more than a thousand species of trees. Approximately eight thousand species of plants occur in Guyana, half of which are found nowhere else.
The local climate is tropical and generally hot and humid, though moderated by northeast trade winds along the coast. There are two rainy seasons, the first from May to mid-August, the second from mid-November to mid-January.