Genesis 36:8-9

36:8 So Esau (also known as Edom) lived in the hill country of Seir.

36:9 This is the account of Esau, the father of the Edomites, in the hill country of Seir.

Deuteronomy 1:2

1:2 Now it is ordinarily an eleven-day journey from Horeb to Kadesh Barnea by way of Mount Seir.