http://www.taraka.most.org.pl/slow/mapa.htm

It presents the cultural situation in central and Easter Europe in early Iron age (5th-2nd c BC)

just for orientation:


black dashed line: the area of ancient baltic rivers and lakes

red lines: archeological cultures which can be regarded as
slavic (blato-slavic)

beyond blue lines:
S.S: scythian and saramtian circle
G-D: Geto-Dacs
C: Celts, of the la Tene Culture
G: Germans of the Jastorf Culture

inside brown lines:

lusitan culture marked with a special polish chracter
pomeranian culture

thick yellow line: border of forest and steppes