In Supai, a village at the bottom of the Grand Canyon, mail is still delivered by mule.
Why it is true
The Havasupai tribe's village has no road: it can only be reached on foot, on horseback or by helicopter. Mule trains carry letters, parcels and even groceries down about 13 kilometres of trail. It is the last mule mail route in the United States.
Source: United States Postal Service
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