A map showing the Byzantine themata (administrative units) of the Byzantine Empire in 1045 CE, focusing on central Balkans around the region of Macedonia.  The Macedonian thema is in what today is part of present-day Bulgaria, while the Bulgarian thema includes what today is the Republic of Macedonia. Note that the thematic boundaries in this map, especially those of Strymon and Macedonia, are very inaccurate. Macedonia was catually located further south, up to the Aegean coast of western Thrace
This is a derivative work of a more complete map created by Andrei Nacu of the English Wikipedia.
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