Kenya's capital city is Nairobi. Kenya also has other great cities like Mombasa and Kisumu which offer unique environments. Kenya offers a unique combination of exceptional game viewing and a vibrant mix of colourful ancient cultures with over 40 different tribes. The country is home to some of the best national parks and game reserves in Africa with diverse ecosystems, from snowcapped mountains, semi-arid desert regions and rainforests, to acacia-studded savannahs, flamingo lakes, white palm-fringed ocean beaches and coral reefs. Sitting astride the equator, Kenya enjoys a good year round climate and has a sophisticated infrastructure with a variety of excellent accommodation options in hotels, lodges, luxury camps, tree hotels and even private luxury mobile camps in prime wildlife locations. Kenya is also host to the annual wildebeast migration which only happens in East Africa. One of nature's most impressive displays of wildlife, the migration can be seen in the Mara-Serengeti ecosystem where it is estimated that over two million animals migrate in a year-round pattern, following the rain and greener pastures.