What Mark here says, that the herd was about the mountain, and what Luke calls on the mountain, are by no means inconsistent. For the herd of swine was so large, that some part were on the mountain, the rest around it.
It goes on: “And the devils besought Him, saying, Send us into the swine, that we may enter into them.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Con. Evan, ii, 24