At 364,875 mi² (945,087 km²), Tanzania is the world's 31st-largest country (after Egypt). It is comparable in size to Nigeria, and is slightly bigger than double the size of the U.S. state of California.
Tanzania is mountainous in the north-east, where Mount Kilimanjaro, Africa's highest peak, is situated. To the north and west are the Great Lakes of Lake Victoria (Africa's largest lake) and Lake Tanganyika (Africa's deepest lake, known for its unique species of fish). Central Tanzania comprises a large plateau, with plains and arable land. The eastern shore is hot and humid, with the island of Zanzibar lying just offshore.
Tanzania contains many large and ecologically significant wildlife parks, including the famous Ngorongoro Crater, Serengeti National Park in the north, and Selous Game Reserve and Mikumi National Park in the south. Gombe National Park in the west is known as the site of Dr. Jane Goodall's studies of chimpanzee behavior.