In Dawn of Sorrow, on Yoko's room, there's a map on the wall. Even if it appears prominently featured due to the way it's framed, it is a map with no striking features at first glance, being there just to enrich the background. Within the game's universe, however, this map could be the only thing that marks the location of the Lost Village (which, in Japanese, is called the "Village Vanished From The Map").
For a long time I tried to find out if that map meant something or was from somewhere, because I know that these more artistic assets are made from a larger art created previously, and then scaled down and cleaned into pixel art format. I did not succeed for a very long time and started considering the map just a detail without significance (such as many across these games), but the flea behind my ear continued to disturb me. By luck, it's possible that I have now figured out where the map came from.
The same map appears as the background image during the Lament of Innocence credits:
Notice that the overall shape of some areas are eerily similar:
And that would not be the first thing appearing on Dawn that was used on Lament: Walter's exact castle appears on Dawn's title screen. My hypothesis was that Dawn events occurred on the same area as Lament, and now that hypothesis has gotten a bit stronger.
You will notice some inconsistencies on the maps, and I chalk those up to the compression that the original map suffered when it was converted and manually cleaned to be readable on the small screen as pixel art. It is possible that the pixel artist has modified colors and distorted some areas slightly (such as the topmost mountain range that seems stretched/wider in Dawn) in the correction/conversion process. But you can see that the area supposed to be a coastline fits perfectly even in the dark colors near the upper right corner of the two maps. You can also see the similarities of the mountain range at the top and the position of the details on the left side.
Now, as I said above, it's a POSSIBILITY, not a certainty, because of one detail: This image on Lament might not be a map at all. If you look closely, you can see at the top that those look like towers, not "map details", and this image might in fact be an illustration of Walter's Castle. However you can CLEARLY see what appear to be roads and mountain ranges on the same illustration, and a compass/wind rose symbol on the lower right, indicating that my analysis could be correct, and the map on Lament is heavily distorted because they transposed an image of Walter's Castle onto a map illustration.