Agua Blanca is a private community situated within the Machalilla National Park in Ecuador, featuring the remnants of the ancient South American civilisation of the Monteno, a brightly painted church, and a museum. The site is popular with visitors because of the trailheads and the sulfur lagoon where visitors can apply mud masks before having a swim. Facilities include changing rooms and bathrooms with showers, as well as a small cafe selling beverages and snacks.