Ruaha National Park is the least accessible park in Tanzania and as a result the landscape remains relatively untouched. Birdwatcher's can enjoy over 400 species of bird that are not found in northern Tanzania, and the river, spectacular gorges, and majestic trees are especially appealing to photographers. As Tanzania's second largest park, Ruaha has large herds of buffalo, elephant and gazelle. The concentration of elephants are some of the largest in Tanzania. The Great Ruaha River is the main feature of Ruaha National Park providing magnificent wildlife viewing on the banks. The river also provides much of the electricity to Tanzania through a hydroelectric dam at Kidatu.