Great Migrations
The river crossings that make the wildebeest migration look impossible
Huge herds compress into crossing points where movement, dust, water, predators, and panic collide.
Video: National Geographic. Embedded from the original YouTube source.
The mechanism
Why this happens
The herds move in response to seasonal rainfall and changing access to fresh grazing and water.
Season & place
Where this event happens
Serengeti-Mara ecosystem, Tanzania and Kenya · Annual migration. Timing and local conditions can vary from one occurrence to the next, so current local guidance matters when planning around a recurring event.
The famous river-crossing videos are one dramatic chapter in a much larger annual movement through the Serengeti-Mara ecosystem.
Large herds follow shifting resources, and bottlenecks at rivers create the dense scenes that travel widely online.
What to know
- The migration is a continuous ecosystem-scale movement rather than one single crossing.
- River crossings are among the most dramatic and heavily filmed moments.
- Exact timing varies with environmental conditions.
If you go
Watch without becoming part of the problem.
Follow local closures and wildlife guidance, keep a responsible distance, avoid blocking migration or access routes, and do not disturb roosts, nesting areas, dens, or concentrated animals for a photo. Conditions and access rules can change quickly.
Good questions
What people usually want to know
Why do wildebeest migrate?
They move through the ecosystem following seasonal rainfall, water, and fresh grazing.