Which valley does the Arenales River flow through?
Arenales River The Arenales River (Spanish, Río Arenales) is a river of Argentina. A tributary of the Salado River, the Arenales flows through the city of Salta.
Piedra River (Colorado) The Piedra River (also known as El Rio De La Piedra Parada, Pedra, Rio, and Rio Piedre) is a river in the U.S. state of Colorado. It drains parts of Archuleta, Hinsdale, and Mineral counties along a mainstem length of about 40 mi . The river flows through a series of isolated box canyons, emptying into the San Juan River at Navajo Lake. Its name stems from the Spanish word, "piedra", meaning "rock".