Floetenstein
Rummersberg
Correct German spelling: Flötenstein, Rummersburg
[Berg=mountain but Burg=castle]
Confirming:
Baldenburg (German), Biały Bór (Polish), Szczecinek County, Western Pomeranian Province, 2219 inhabitants (in year 2010)
Rummelsburg(German), Miastko (Polish), Bytów County, Pomeranian Province, 10 841 inhabitants (in year 2009)
Flötenstein (German), Koczała (Polish), Człuchów County, Pomeranian Province
Although these places are located in three different counties and two different provinces, they are in fact close to each other:
Biały Bór - Koczała - 24 km by road
Miastko - Koczała - 20 km by road
See Google maps: Koczała, Polska