Great Migration one of the natural seven wonder in the world take place at Masai mara river: start July to late in September, also 2 weeks of October through early November (more than one million of wildebeest cross the Masai mara river and 500000 zebras with 200000 Thomson gazelles each year face the obstacles of the crocodiles in the river during the cross don’t miss it book now in wipa safaris for good price.