Appen is on the road to Fort William from Oban and has some wonderful views of Loch Creran as it flows out into Loch Linnhe. The Castle Stalker is a phenominal landmark to look out for, and can be seen from a lot of angles as you drive round Appin.
Loch Linnhe is the loch that goes all the way to Fort William, it is a large sea loch that eventually flows into the Forth of Lorne and out into the Atlantic Ocean.
You are in fact on the borders of Lochaber and the Highlands.