sorry if you already know this but,
I think Chirs is messing with them again, if you look closely
1. the mountain from the third TDA Challenge looks similar to the mountain from the first TDI Challenge except the TDA one has a dirt path
2. the location of the trailers in TDA, are in the same location as the cabins in TDI
3. The path the Lame-o-sine rides out of TDA is vaguely similar to the dock of shame in TDI, except the boardwalk/bridge is longer
Conculsion: TDA's abandoned film set is in the same place as the TDI island, in fact they're both the same place with a few minor tweaks.
As proved by Courtney in Total Drama Drama Drama Drama Island, it's close to civilization (right next to a fast food restraunt)
bet Courtney's gonna be really ticked to find out she's been tricked again!