"Well," the boy went on, "if that really is Vilcanota, we are still in the land of the living.  In fact, we can't be more than twenty-five miles from a town, and there is a railroad--so my maps say--over to the east.  It ends at Sicuani, and there the upper branch of the Uacayli river begins.  This river empties into the Amazon at the head of steamboat navigation, the maps say."