If you compare the regions of Washington, which pair below is most unlike each other?
Olympic Peninsula and Puget Sound
Blue Mountains and Willapa Hills
Columbia Basin and Olympic Peninsula
Okanogan Highlands and Columbia Basin

Question

If you compare the regions of Washington, which pair below is most unlike each other? 
       Olympic Peninsula and Puget Sound
       Blue Mountains and Willapa Hills
       Columbia Basin and Olympic Peninsula
       Okanogan Highlands and Columbia Basin

firejay5 · Answer

See if this helps, other than that I really don't know: http://www.infoplease.com/encyclopedia/us/washington-state-united-states-geography.html