South Africa ranks sixth out of the world's seventeen megadiverse countries. The coastline of the country stretches for more than 2,500 kilometers along two oceans, the South Atlantic Ocean and the Indian Ocean. In recent years, ecotourism has become increasingly popular in South Africa as a possible method of conserving and enhancing biodiversity. This unique combination of oceanic influences has given rise to an astonishing array of ecosystems, from the cool, nutrient-rich waters of the Benguela Current off the west coast to the warm, subtropical waters of the Agulhas Current off the east coast. The coastline's varied topography, which includes rugged cliffs, sandy beaches, and rocky shores, further contributes to its remarkable biodiversity. South Africa's coastal ecosystems support an incredible range of marine life, including over 12,000 species of fish, many of which are found nowhere else on the planet. The coastline is also a vital breeding ground for several endangered species, such as the African Penguin and the Southern Right Whale. Furthermore, the coastal wetlands and estuaries provide crucial habitat for numerous migratory bird species, including the vulnerable African Black Oystercatcher and the endangered Damara Tern. The Bushveld is home to many mammals, including lion, African Leopard, South African Cheetah, Southern White Rhino, Blue Wildebeest, kudu, impala, hyena, hippo and South African Giraffe. Much of the bushveld exists in the northeast, including Kruger National Park and the Sabi Sand Game Reserve, and in the extreme north in the Waterberg Biosphere. In addition, the country is home to many endemic species, including the critically endangered Riverine Rabbit.