Here is something else that is interesting about Thracian placenames, this time with regard to the suffix 'diza' which has evolved into Slavic 'itsa', again, the 'd' is dropped. In ancient times it seems to be largely present in eastern Thrace, and given its widespread use in varying degrees among the Slavic languages, the particular tribes that employed such names more frequently are likely to have spread from this area originally.
Thracian (Most are likely to have appeared on record in the 'Hellenized' form, ie; 'os' suffix):
Tyrodiza, Kistidiza, Tarpodiza, Beodiza, Ostudiza, Bortudiza
Slavic:
Strumitsa, Bistritsa, Belitsa, Banska Stiavnitsa, Koprivnitsa, Virovititsa
Thracian (Most are likely to have appeared on record in the 'Hellenized' form, ie; 'os' suffix):
Tyrodiza, Kistidiza, Tarpodiza, Beodiza, Ostudiza, Bortudiza
Slavic:
Strumitsa, Bistritsa, Belitsa, Banska Stiavnitsa, Koprivnitsa, Virovititsa
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