Does your map work in Oblivion. If there are errors in the map then annwyn wont fix them and they will translate across. Whats the exact sequence youre using?
the map is fine works in tesannwyn and works in worldmachne , I don't have to test in oblivion , the esp read by oscape reads some holes that are not in the map ...
plus doesnt make the sea lod ...
and the central texture seems to have a weird black border , while the overall distant lod textures seem different ...
even when not using oscape it looks with no holes but Oscape messes somehow the raw map file ...