I love this Google Map.
Given the location, I think it must be - I'm assuming that the whole area before the doors (given the relatively small size of it) is Elderslade (according to the Wells of Langflood map) which presumably includes the doors of Gundabad.
The questions which arise from that are:
1) Is the entire Gundabad expansion zone going to be underground? (Given how small the 'Elderslade' area appears to be - about the size of Misthallow).
2) Will the War of the Three Peaks area (coming at the end of this year) be in this Elderslade area, or in a more mountainous zone nearby? Either in the Misties or the Grey Mountains?
Were there any updated tiles in the area between Bree-land, Evendim and the North Downs? There's been something going on there in terms of changing the landscape (and various mobs seen beyond the hills), as well as the tower overlooking the Bree-fields.