Western Serengeti corridor:

Grumeti River crossing.
By the time the month of June comes, the movement of the wildebeests, zebras and antelopes should be in the western corridor or should be in coming in the days a head. The western Serengeti corridor is named like that due to the Serengeti National park “historical thumbs up” shaped boundary, and how the moving wildlife seems to squeeze through and turn around later heading northwards. The park limits go as far as Lake Victoria, the park can be reached from northwestern Tanzania region from Mwanza town. If one has not noticed it by now, there is variation in the vegetation: from plains grass to mixture of acacia woodland and savannah plains grass. The additional wildlife sighting opportunities also brings a different attitude as you have the opportunity to sight crocodiles, more hippos, and leopards staying around on the acacia trees next to riverbeds of the Grumeti, which flows into Lake Victoria.

Two interesting scientific questions have yet to be answered about
Western Serengeti corridor.
One, wildebeests moving from the south stop and mix with “resident wildbeest of the western corridor, and do not join the current movement. Question is why?

Two, if the movement’s main target and aim is looking for water and greener grass, then at the depth of the migration in the western corridor, why do wildebeest not continue on wards to Lake Victoria, which has enough fresh water, but instead perform a complete turn around and continue their journey northwards traversing plains and rivers and facing gruesome challenges posed by predators?

Tanzania Guide