Rashi on Deuteronomy
כל יד נחל יבק means, ALL THE DISTRICT BESIDE THE BROOK OF JABBOK.
Siftei Chakhamim
All along Wadi Yabok. (Literally, “The hand of Wadi Yabok”). Since a person’s hand is always at his side, any edge can be referred to as “hand.” See Parshas Shemos regarding the verse (2:5), “Walking on the edge (יד) of the river.”