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The Eastern Romance languages developed from the Proto-Romanian language, which in turn developed from the Vulgar Latin spoken in a region of the Balkans which has not yet been exactly determined, but is generally agreed to have been a region north of the Jireček Line.
That there was language contact between Latin or Vulgar Latin speakers and speakers of indigenous Paleo-Balkan languages in the area is a certainty; however, it is not known which Paleo-Balkan language or languages comprise the substratal influence in the Eastern Romance languages.
The substratal elements in the languages are mostly lexical items. Around 300 words are considered by many linguists to be of substratum origin. Including place-names and river-names, and most of the forms labelled as being of unknown etymology, the number of the substratum elements in Eastern Romance may surpass 500 basic roots. Linguistic research in recent years has increased the body of Eastern Romance words that may be considered indigenous.
In addition to vocabulary items, some other features of Eastern Romance, such as phonological features and elements of grammar (see Balkan sprachbund) may also be from Paleo-Balkan languages.