Where is the "Avenue of Volcanoes"?

Running for 200 miles south of Quito between two parallel cordilleras, Ecuador's "Avenue of the Volcanoes" contains seven peaks more than 17,000 feet high. Two of the other volcanoes, 17,160-foot Sangay and 16,480-foot Tungurahua, are generally cited as being among the 10 most active in the world.