Along the Pan-American Highway, from Cotopaxi to ChimborazoThe Sierra is the Andean region of Ecuador that's crossed by the Pan-American Highway. The other regions are Selva, home to the Amazon Rainforest and the Costa, which borders the Pacific Coast. Often called the 'Volcano Route', it boasts a dozen volcanoes, including the highest and most active in the world. And we're off to a giddy 3,000m altitude...