Selous is a huge conservation area in southern Tanzania. So large, in fact, that it comprises Africa's single largest game reserve - three times as big as the Serengeti and twice the size of the Kruger National Park in South Africa. Endangered wild dogs and large numbers of lion, elephant, hippo and giraffe are Selous' trump cards. There's also a decent chance of seeing black rhinos, sable and puku on a Selous safari.
The wetlands around the Rufiji River, Tanzania's largest river, are a particularly enchanting spot for wildlife watching in the reserve. Guided game walks often result in thrilling wildlife encounters, while boat trips provide the chance to see crocodiles and hippos in the water and other large mammals coming to the river to drink. Water birds such as plovers, storks, waders, herons, egrets and kingfishers can also be sighted in Selous, so it's worth investing in some good binoculars before travelling.