The Danube River.
Eastern
Balkan peninsula
Apennine Peninsula, Iberian Peninsula, Balkan Peninsula, Crimean Peninsula, Jultand Peninsula, Scandinavian Peninsula, Peninsula of Brittany. A few small ones: Kerch Peninsula, Attican Peninsula, Thracian Peninsula, Campanian Peninsula, Peloponnesian Peninsula.
Eastern Europe. Though there are several subdivisions, like the Balkan Peninsula and the Baltic States.
Balkan peninsula is in Europe or (Eurasia in a five-continent-model).
South of Danube, Southern Europe (Europe ends at the URAL mountains!)
Serbia is located in southeastern part of Europe in central part of Balkan peninsula.
Southeastern Europe; the Balkan Peninsula.
Europe, on the Balkan peninsula (Serbia and Bulgaria).
Iberian Peninsula, Italian Peninsula and Balkan Peninsula.
What is the westernmost peninsula in Europe?
The Balkan peninsula.