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Qala Wust (name variants: Kala Wust, Ūst, Qal‘ah-ye Ūst (BGN standard), Qal‘a-i-Ūst, Qala Ust, Qala Yost, Qal‘eh-ye Vost) is a mountain village in the Wakhan region of the Badakhshan Province, north-eastern Afghanistan.
Qala Wust is a settlement of Tajik highlanders.
The village gave names to the Qala Wust Valley, Qala Wust Gneiss formation, and made a former name (Koh-i Qala-i Ust; koh-i means "mountain of") of the Kohanha massif.

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