The Mountains that are the six zones right above The Shadow of The Mountain and to the right of The Harbour Zone:
The Gentle Climb
The Frigid Heights
The Precarious Ledge
The Gentle Climb
The Rocky Pass
The Windy Peak

When you have times that you're not sure where you're supposed to go, this feature is an excellent helper:
Click on the World Map Icon that's at the top of your bottom row of stuff. When the map opens, click on "Show Active Quests" and it opens a Sidebar showing the Quests that you're currently working on. Hover your mouse over the Quest that you need to find out where to go, and it will highlight in yellow all of the squares on the map that you need to work in for that particular Quest. If a Quest Name is in Green, it's on the main map, but if it's in Red, it's in one of the little maps that you have to get to through clicking one of the squares on the main map - they call these "Sub-Zones or Mini-Zones". If it's Red, go to that other little zone, and do the same thing with hovering your mouse over the name.
There are some Quests that don't seem to show on that Sidebar, and the same information can be seen by clicking on the yellow ! next to the map icon, but make sure to click the ! once to open it, then again on the ! - the little treasure chest is for info on any maps that you might purchase at the Museum.

(I copied it over so that I wouldn't get confused - I hadn't seen your thread on that, and I think the Shingles do come after the bricks.)
"Find 20 Shingle Shipments and bring them to Mr. Smith in the Haven Commons. Shingle Shipments can be found scattered throughout most desert, swamp, and forest zones."
"Show Active Quests shows not a single Desert square, but does show Mountain and Snowy where the crates DO NOT actually appear."

So, you're saying that the Active Quests Feature is actually directing people to the wrong areas on this one? If so, that's really going to mess up, and totally frustrate someone who's not real familiar with the map yet - wow - not good.