[1] : WordNet (r) 2.0

rift valley
     n : a valley with steep sides; formed by a rift in the earth's
         crust

Rift Valley >> R Words
Rift Valley, definition of term: Rift Valley
rift+valley_pag1.html

Rift >> R Words
Rift, definition of term: Rift
rift_pag1.html

Squaw Valley >> S Words
Squaw Valley, definition of term: Squaw Valley
squaw+valley_pag1.html

Simi Valley >> S Words
Simi Valley, definition of term: Simi Valley
simi+valley_pag1.html

Silicon Valley >> S Words
Silicon Valley, definition of term: Silicon Valley
silicon+valley_pag1.html

Fountain Valley >> F Words
Fountain Valley, definition of term: Fountain Valley
fountain+valley_pag1.html