The Mara River, central to the Maasai Mara National Reserve and Serengeti ecosystems, is a prime wildlife viewing destination, particularly during the Great Migration (roughly July to October) when millions of wildebeest and zebras cross the river, attracting predators like crocodiles and big cats. Accessibility can be challenging, especially during the rainy season, often requiring 4x4 vehicles. Guided tours are highly recommended for safety and to maximize wildlife sightings; solo visits are generally discouraged due to the potential dangers of encountering wildlife. Expect to pay park entrance fees (approximately $70-$80 per person per day) plus the cost of accommodation and transportation. A typical visit lasts 2-4 days to fully experience the area. Note that the river's water levels can fluctuate significantly, impacting crossing points and wildlife distribution.