A.T. Robertson Commentary Mark 8:10

"And straightway he entered into the boat with his disciples, and came into the parts of Dalmanutha." — Mark 8:10 (ASV)

Into the parts of Dalmanutha (εις τα μερη Δαλμανουθα). Matthew 15:39 calls it "the borders of Magadan." Both names are unknown elsewhere, but apparently the same region of Galilee on the western side of the lake not far from Tiberias. Mark here uses "parts" (μερη) in the same sense as "borders" (ορια) in 7:24 just as Matthew reverses it with "parts" in Mt 15:21 and "borders" here in Mt 15:39. Mark has here "with his disciples" (μετα των μαθητων αυτου) only implied in Mt 15:39.