The Frangen Plateau ( bg, Франгенско плато) occupies the easternmost part of the
Danubian Plain (Bulgaria)
The Danubian Plain ( bg, Дунавска равнина, Dunavska ravnina) constitutes the northern part of Bulgaria, situated north of the Balkan Mountains and south of the Danube. Its western border is the Timok River and to the east it borde ...
.
Geographical Dictionary of Bulgaria, page 515.
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References
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Plateaus of Bulgaria