I’ve found two maps of the Dessarin Vale, as shown below. The left one I’m almost sure of is an official map, although I do not know where it was published. The right one is an often found map, but I’m sure is an edited version of the High-Resolution Sword Coast map. It’s correct most of the time, but does contain errors here and there. Shown here you can see that where it puts "Settlestone", should have been "Winters Edge" (although not exactly). Likewise, on the official map High Hold seems to overlap with Zymorven Hall.
The thing that I’m trying to figure out is where Zymorven Hall is actually located. Ideally published map would be nice, but it may not exist. Second best is a description of where it would probably be.