The Rio Sucio or "Dirty River", where one branch is colored yellow/brown by the minerals it carries from the Irazu Volcano, is seen mixing with the clear waters filtered by the tropical rainforest in the Braullio Carrillo National Park, 50 km (31 miles) east of San Jose. This aerial view was shot using the AS900 Droidworks Hexacopter with an average of 60 photos to provide good resolution from above.