The Marañón River is a major waterway in northern Peru, flowing approximately 1,100 kilometers. It is considered the main tributary of the Amazon River and plays a crucial role in the region's ecology and economy. The river originates in the Andes mountains and traverses diverse landscapes, supporting various ecosystems and wildlife. The Marañón River is also significant for local communities, providing water for drinking, agriculture, and transportation. Its banks are home to numerous indigenous groups who rely on the river for their livelihoods. The river's rich biodiversity includes fish species that are vital for both local diets and commercial fishing.