#7
Reserva de la Biosfera Tehuacán-Cuicatlán
Reserva de la Biosfera Tehuacán-Cuicatlán, a UNESCO site, protects the world's most diverse columnar cacti—81 species, including the 15-meter cardon—in a transitional desert ecosystem. It also safeguards the earliest evidence of maize, squash, and chile domestication, a history 30% older than that at #7 Sumidero Canyon. This site is a living archive of arid land evolution.
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