It is a high valley edged by serrated peaks , a remote expanse the size of Connecticut lying, as if forgotten, between two mountain ranges. Here, North America's tallest sand dunes blow against glacier-gouged summits, the Rio Grande begins its long journey from snowflake to saltwater, and vast reaches of desert scrub hide verdant pocket wetlands. Colorado's San Luis Valley is not a place for the timid. Sizzling hot in summer, frigid cold in winter,...
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