USAs delstater med flest daler: Fjellregioner fra Colorado til New Hampshire

Daler dannes der tektonikk, erosjon og isbreer hugger ut lavland mellom høyland. Delstater med utstrakte fjellkjeder har flest daler:

1. Colorado — Rockies: Cache la Poudre, San Luis, Yampa, Roaring Fork daler.
2. California — Sierra Nevada, Kystfjell: Yosemite, Napa, Sonoma, Central, Imperial, Death Valley.
3. Washington — Cascades, Olympics: Methow, Skagit, Yakima, Hoh daler.
4. Oregon — Cascades, Siskiyous: Willamette, Rogue, Umpqua, Grande Ronde daler.
5. Idaho — Rockies, Sawtooths: Sawtooth, Salmon River, Wood River, Treasure Valley.
6. West Virginia — Appalachians: New River Gorge, Shenandoah (strekkes til VA), Greenbrier, Potomac daler.
7. Pennsylvania — Appalachians: Wyoming, Lehigh, Cumberland, Susquehanna daler.
8. New York — Adirondacks, Catskills: Hudson, Mohawk, Finger Lakes (isbre-daler), Schoharie daler.
9. Vermont — Grønnfjell: Champlain, Mad River, Winooski, Connecticut River daler.
10. New Hampshire — Hvite fjell: Pemigewasset, Conway, Connecticut River, Lost River daler.

Andre dalrike stater: Montana, Wyoming, Utah, Arizona, Nevada, North Carolina, Tennessee, Kentucky, Virginia, Maryland.