Most of Bangladesh is covered by the Bengal Delta, the largest delta on Earth. The country has 700 rivers and 8,046 km (5,000 mi) of inland waterways. Highlands with evergreen forests are found in the northeastern and southeastern regions of the country. Bangladesh has many islands and a coral reef. The longest unbroken sea beach of the world, Cox’s Bazar Beach, is located in the southeast. It is home to the Sundarbans, the largest mangrove forest in the world. The country’s biodiversity includes a vast array of plant and wildlife, including endangered Bengal tigers, the national animal.