Hi, Assynt is one of the most beautiful parts of this earth! Once seen never forgotten.
There is quite a clear map showing the region on the following web site plus some really good info and more beautiful pictures.
ww.presence.co.uk/assynt/assind.htm
Ullapool is in Ross & Cromarty; Lochinver is in Assynt. Try to find both those places on your map of Scotland and this will give you an idea. There are many requests for info on Assynt families on the Sutherland mailing list. You can get details of this from the index page of Highland Hearts. Hope this helps, Christine