Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

Is there a map i can refer to about the miles/distance from S'shamath to the Upperdark? sorta curious.

According to Realmshelps, the Upperdark is within 3 miles of the surface (in terms of depth), Middledark is 3-10 miles and Lowerdark deeper than 10. Depth, however, does not necessarily relate to distance travelled as it may take tens or hundreds of miles of winding tunnels, abseiling crevasses and other such treacherous spelunking to travel not only top to bottom, but city to city.

One thing that has always bothered me (as a casual spelunker!) is how 'flat' NWN2 cave tilesets are, but I suppose consideration can be made for several thousands of years of well-trodden/carved out trade routes between Underdark and Surface destinations.

Sshamath itself is a Middledark city, resting within the 3-10 mile depth. It's closest surface counterpart is in fact Darkhold, laying just to the west of the Glimmersea on the map below: