Tsavo West National Park’s vast expanse stretches from the Athi river, North of the Mombasa-Nairobi road and south to the Tanzanian border. The North Eastern boundary along the Athi river adjoins Tsavo East National Park,.
The park's habitats include open plains alternating with Savannah bush and semi desert scrub, acacia woodlands; rocky ridges and outcrops, and more extensive ranges and isolated hills; belts of riverine vegetation; palm thickets and on the Chyulu hills, mountain forest. The numerous rocky outcrops and ridges around the Chyulu Hills, are of recent volcanic origin including the Shetani lava flow. In the far south western corner on Kenya Tanzania border is Lake Jipe. This very attractive lake is fed by runoff from Mt. Kilimanjaro and the North Pare mountains
Mzima Springs, in the North of the park is another interesting feature. Water that has filtered underground from the Chyulu Hills gushes out from a lava ridge into a series of clear pools. These natural springs produce about 50 million gallons of fresh sparkling water daily. The waters are alive with shoals of fish, Hippos and waterfowl. A unique underwater observatory gives an incredible view of this crystal clear underwater world, where massive hippos glide silently through swirling shoals of fish. These springs have created a sprawling wetland paradise of giant Raphia palms and water birds. Mzima is also the main source of Mombasa's water supply. The well marked nature trails, an observation platform and an underwater glass tank, provide a special vantage point to view this remarkable oasis.
Tsavo is birdwatcher’s paradise with numerous species of weavers, hornbills, sunbirds, rollers, raptors etc. Not far from Mzima Springs, along a well-marked track, lies the precipitous magnificence of the Ngulia escarpment at the foot of the Ngulia Hills, which rise to 1825 meters. Each year from late September to November, Ngulia becomes the base of a unique phenomenon. Attracted by the lights of Ngulia Lodge, thousands of migrant birds descend through the mists.  It has become one of the bird wonders of the world and provides vital information on the migratory routes and the habits of many species common to the northern hemisphere.