Єнісей is one of the longest rivers in the world, flowing through Russia and Mongolia. It stretches approximately 5,539 kilometers (3,445 miles) and is known for its vast watershed, which covers an area of about 2.5 million square kilometers. The river originates in the Sayan Mountains and empties into the Kara Sea. The Єнісей River plays a crucial role in the ecosystem and economy of the regions it traverses. It supports diverse wildlife and is vital for local communities, providing water for drinking, agriculture, and transportation. Additionally, the river is significant for hydropower generation, with several dams built along its course.