Haunted Gulch (map? biome?) is mentioned but doesn't exist

In the list of preset skirmishes, the placard for Battle of the Valley reads “3X3”, “Standard”, and “Haunted Gulch”.
“Haunted Gulch” does not show as a map type or as a terrain type.
And when you actually click on Battle of the Valley, its map type shows as Mountain Pass and its biome shows as Asian Temperate.
I’d LOVE to see/play in Haunted Gulch, but the option is either hidden or doesn’t (seem to) exist, and the preset Battle of the Valley apparently doesn’t involve it. A typo/vestige? Or is the place in there somewhere?