A Mapped Area is a collection of Official GPS Routes for an area. Look at the Phoenix Mountain Preserves for example. Here the most popular inner city trail is surrounded by lesser known trails. Reviewing it here makes it easy to form your own loops.
Areas for Forests(FS), National Parks(NPS), Wilderness Areas(WA) & National Trails(NAT) are automatically setup. Other areas such as parks or hikes in a book are called HAZ Areas.
If you are interested in creating a new HAZ Area contact the webmaster with a comma separated list of description IDs. That is the ZTN= figure listed in the URL of description pages. Maps under 200 routes are best.