The western region of Serengeti marks the beginning of the Western Corridor, a natural highway that stretches all the way to Lake Victoria. A small but lush area, it is crossed by the Mbalageti and Grumeti Rivers, where the first round of Great Migration River Crossings take place between May and June. A visit during this time will reward you with thrilling game viewing as wildebeest and zebras plunge across the Grumeti River, in hopes of dodging the snapping jaws of Nile Crocodiles in an attempt to reach the other side.