Talk:Great Divide/@comment-2217546-20120121060625/@comment-3403431-20120121071919

If the Great Divide was part of a mountain range at all, it could be blamed on a "rain shadow" impacting the dry side of it, which could be that canyon.

More: http://en.wikipedia.org/wiki/Rain_shadow But again, the GD does not seem to be involved in any mountain range, so...