The Maasai Mara Game Reserve is a large game reserve in south-western Kenya, which is effectively the northern continuation of the Serengeti National Park game reserve in Tanzania. It is famous for its exceptional population of Big Cats, game, and the annual migration of zebra, Thomson’s gazelle, and wildebeest from the Serengeti every year from July to October, a migration so immense that it is called the Great Migration.  Wildlife is not held within the reserve, many private reserves surround the game reserve offering very private and first class safari experiences.  The river crossings of the Mara River happen during August each year.  Location is important, as the number of actual crossing areas is small.  Driving large distances to reach these areas is not good planning, talk to an expert.