Kajiado County in the context of Kilimanjaro Region

Nyiri Desert, also called The Nyika, Taru Desert, Taru desert, is a desert in southern Kenya. It is located east of Lake Magadi and between Amboseli, Tsavo West and Nairobi National Parks. A high proportion of Kajiado County's land area is covered by the Nyiri Desert. Its aridity is caused by the rain shadow of Mount Kilimanjaro.

Arusha Region (Swahili: Mkoa wa Arusha) is one of Tanzania's 31 administrative regions and is located in the northeast of the country. The region's capital and largest city is the city of Arusha. The region is bordered by Kajiado County and Narok County in Kenya to the north, the Kilimanjaro Region to the east, the Manyara and Singida Regions to the south, and the Mara and Simiyu regions to the west. Arusha Region is home to Ngorongoro Conservation Area, a UNESCO World Heritage Site. The region is comparable in size to the combined land and water areas of the state of Maryland in the United States.

Arusha Region is a tourist destination in Africa and is the hub of the northern Tanzania safari circuit. The national parks and nature reserves in this region include Ngorongoro Conservation Area, Arusha National Park, the Loliondo Game Controlled Area, and part of Lake Manyara National Park. Remains of 600-year-old stone structures are found at Engaruka, just off the dirt road between Mto wa Mbu and Lake Natron. With a HDI of 0.721, Arusha is among the most developed regions of Tanzania being Tanzania's top 3 most resourceful region.

Amboseli National Park, formerly Maasai Amboseli Game Reserve, is a national park in Loitoktok District in Kajiado County, Kenya. It is 39,206 ha (392.06 km) in size at the core of an 8,000 km (3,100 sq mi) ecosystem that spreads across the Kenya-Tanzania border. It harbours 400 species of birds including water birds like pelicans, kingfishers, crakes, hamerkop and 47 raptor species. The local people are mainly Maasai.

The park protects two of the five main swamps and includes a dried-up Pleistocene lake and semiarid vegetation.