Clue 1: This national park hosts the lowest land elevation in North America.

Clue 2: During the last Ice Age, this valley was partially filled with ancient Lake Manly in southern California.

The URL of this page is: http://3dparks.wr.usgs.gov/poster/html/f.html
Maintained by Webmaster, Menlo Park, CA
Last modified: 6/20/2008