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2. Has been a part of Prussia
4. Is split between different countries
5. Most Kashubian speakers live there
6. Has a region of Czechia partially named after it
7. Has a famous dog breed named after it
8. Has the lowest german population
9. Wrocław is located in it
10. Its etymology is related to the sea
11. The Oder river passes through it
12. Gdansk is located in it
13. Was once a part of Austria
14. Polish is the most widely spoken language there
15. A part of it was once Swedish