- Crossing the widest estuary in the world, the Rio de la Plata, between Buenos Aires and Colonia, Uruguay. An estuary is a place where salt water and fresh water mix in a highly sensitive environment. RГo de la Plata grows from 48В kilometres (30В mi) wide where two rivers meet to 220В kilometres (137В mi) wide to the southeast where it opens on the Atlantic Ocean. Photo by Dani Voirin.
To see more from contributing photographer Dani Voirin, click here.