John Gill Commentary Luke 8:26

"And they arrived at the country of the Gerasenes, which is over against Galilee." — Luke 8:26 (ASV)

And they arrived at the country of the Gadarenes
In (Matthew 8:28) it is called the country of the Gergesenes, (See Gill on Matthew 8:28) as it is here, in the Arabic and Ethiopic versions; and "of the Gerasenes", in the Vulgate Latin; but the Syriac and Persic versions read, "of the Gadarenes", as in (Mark 5:1) . (See Gill on Mark 5:1).

which is over against Galilee :
from where the ship launched, and Christ and his disciples came.