Canyon
To dream of a canyon represents feelings of having a lot of space, freedom or options, but feeling overwhelmed or unsure on how to use or utilize it effectively. Feelings of insignificance and smallness, as well as feelings of being overwhelmed by the challenges of life.
Example: A woman dreamed of being in a canyon type area. In waking life she was looking for a new job and couldn't find one that was suitable. In this case the canyon might have reflected her feelings about the job market being so open with nothing suitable. Feelings about big enormous companies offering while feeling that couldn't do anything except move on.