bolson

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bol·son

 (bōl-sōn′)
n. Chiefly Southwestern US
A flat arid valley surrounded by mountains and draining into a shallow central lake.

[American Spanish bolsón, augmentative of Spanish bolsa, purse, pouch, from Late Latin bursa; see bursa.]

bolson

(bəʊlˈsəʊn)
n
(Physical Geography) Southwestern US a desert valley surrounded by mountains, with a shallow lake at the centre
[C19: from American Spanish bolsón, from Spanish bolsa purse, from Late Latin bursa bag; see purse]