The Río Maullín Estuary is located in southern Chile, specifically in the Los Lagos Region. It is formed by the confluence of the Maullín River and the Reloncaví Sound, creating a rich ecosystem that supports diverse wildlife and plant species. The estuary plays a crucial role in local fisheries and is an important area for both commercial and recreational activities. The estuary is characterized by its brackish waters, which result from the mixing of freshwater from the river and saltwater from the ocean. This unique environment provides habitat for various species, including migratory birds and fish. The surrounding landscape features wetlands, forests, and agricultural land, contributing to the area's natural beauty and ecological significance.