Off the top of my head:
Goblins Gate, Eagle's Nest, the Enchanted Valley, Lake Cresent, Destruction Island, Hurricane Ridge, The Brothers (a mountain), all in Olympic National Park
Mt. Fury, Mt. Terror, Thunder River, Rainy Pass, Sahale Arm in North Cascades National Park
The Narrows
Summerland in Mt. Rainier National Park
Fort Ebey
Horse Heaven Hills
Grays Harbor
The Willapa Hills (makes me think of gnomes and halflings)
Beacon Rock
Bridge of the Gods - WA/OR
Tons of terrain features carry fantasy names in the Enchantments (there's one mountain tarn known as Gnome Tarn) and in the Norse Peak Wilderness
Spirit Lake and the Ape Caves on Mt. Saint Helens
Oops, forgot Cougar Mountain, Tiger Mountain, Mt. Si, and Rattlesnake Ledge, Golden Gardens, Mount Storm King, and Lake Diablo, Ebey's Landing