In Clan maps of the Border region, land in the Scottish West March associated with Clan Moffat is generally dwarfed by other clans. Indeed, the area associated with Clan Moffat is so small that it can easily be overlooked. Hence the big red arrow and circle in the map below:

Presently, the largest population of Moffats (about 15,000 strong) can be found in the the area south of Glasgow known as Dumfries & Galloway (shaded red in the map below):