Introduction to the Mara River: The Mara River flows through Kenya and Tanzania, with a total length of 395 kilometers, of which 60% is located in Kenya and 40% is located in Tanzania. The river originates in Kenya's rainy mountains and continues to flow even during the dry season. Every year, wildlife crosses the Mara River and migrates back and forth between Kenya's Masai Mara National Park and Tanzania's Serengeti National Park, playing an important role in the world's spectacular wildlife migration. The swollen rapids and crocodile sniping are the most difficult for the animals, and the most spectacular scene for the viewers, known as the Mara River Crossing or the Crossing of Heaven.