Numbers 24:18

24:18 Edom will be a possession,

Seir, ¹  his enemies, will also be a possession;

but Israel will act valiantly.

Numbers 33:47

33:47 They traveled from Almon-diblathaim and camped in the mountains of Abarim before Nebo.

[24:18]  ¹ sn Seir is the chief mountain range of Edom (Deut 33:2), and so the reference here is to the general area of Edom.