A.T. Robertson Commentary Matthew 15:29

"And Jesus departed thence, and came nigh unto the sea of Galilee; and he went up into the mountain, and sat there." — Matthew 15:29 (ASV)

And sat there (εκαθητο εκε). "Was sitting there" on the mountain side near the sea of Galilee, possibly to rest and to enjoy the view or more likely to teach.