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Daugavgrīva castle — Wikipedia
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Daugavgrīva Castle (German: Dünamünde; Polish: Dynemunt; Russian: Усть-Двинск or Ust`-Dvinsk) is a former monastery converted into a castle, located at Vecdaugava oxbow on the right bank of Daugava, in the northern part of Riga city, in the Vidzeme region of Latvia. Nowadays here are seen only earthen ramparts.
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