Forestdon

A region in north-east Erathia, part of Forestbury.

NOTE: Shaded region covers the entire Forestbury area, including Forestdon in the west.

Trivia

The name Forestdon only appears in the campaign editor, with the Forestbury region being called "Forestdon, Forestbury and Forestlow" in its map based on Long Live the King, whereas the original Restoration of Erathia version of this campaign simply uses the name "Forestbury" in-game.
The RoE versions of both Long Live the King and Song for the Father, list the names of the north Erathia regions as the ones on the left being to the west, and the ones on the right being to the east (eg. the in-game region name for United Front being "Emerald Hills to Woodgrove"), which is maintained in the campaign editor.
Thus, it can be surmised that Forestdon is in the western portion of Forestbury.