The Marañón River is a major river in northern Peru, flowing approximately 1,100 kilometers (about 685 miles). It is considered one of the main tributaries of the Amazon River, contributing significantly to its water volume. The river originates in the Andes mountains and travels through diverse ecosystems, including tropical rainforests. The Marañón River is vital for local communities, providing water for drinking, agriculture, and transportation. It is also home to various species of fish and wildlife, making it an important area for biodiversity. The river's basin supports numerous indigenous groups who rely on its resources for their livelihoods.