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Note: This map uses an SVG map of Europe by User:Tintazul and User:ZorroIII, which is under the CC-BY-SA-2.5 license, for the small location map of Europe in the bottom left corner. The uploader of this map, User:Martyr, licensed it as "Own work, copyleft: Multi-license with GFDL and Creative Commons CC-BY-SA-2.5 and older versions (2.0 and 1.0)", but presumably the GFDL license cannot apply to the small corner map.
1 According to, among others, Crampton, Delev, Dobrev and Lalkov.
2 Bulgaria ruled all land east of the Danube and west of the Dnieper according to Constantine VII's De Administrando Imperio (c. 950), but actual Bulgarian control was often partial, weak and/or inconsistent in many of the scarcely-populated areas north of the Danube.
3 That is, unconfirmed by a peace treaty and only controlled during military campaigns in the Byzantine lands. These, however, comprised much if not most of Simeon's rule.
The northern border is conjectural, as its exact location is practically unattested.
References
Crampton, R.J. (2005) A Concise History of Bulgaria, Cambridge University Press, pp. p. 13 ISBN0521850851
Delev, Petǎr; Valeri Kacunov, Plamen Mitev, Evgenija Kalinova, Iskra Baeva, Bojan Dobrev (2006) "9 Bǎlgarskata dǎržava pri Car Simeon" in (in bulgarian) Istorija i civilizacija za 11. klas, Trud, Sirma
Dobrev, Hristo (1979) (in bulgarian) Bǎlgarski voenen atlas, Sofia: Voenno izdatelstvo, pp. pp. 152−153 OCLC 46136451
Koledarov, Petǎr (1989) (in bulgarian) Političeska geografija na srednovekovnata bǎlgarska dǎržava 2 (1186–1396), Bulgarian Academy of Sciences
Lalkov, Milčo (1997) Rulers of Bulgaria, Kibea, pp. p. 24, p. 66 ISBN954-474-098-8