From the book "Romanian An Essential Grammar":
"Nouns in the accusative preceded by a preposition and not followed by
any modifiers take no article."
That means, for example, you would also say: "lângă oraș" (near the town) instead of "lângă orașul".
I guess in Romanian you don't use the definite article with some prepositions. It seems strange to an English speaker, or speakers of most other European languages for that matter - but they must write: 'the bear is near wolf' rather than 'near the wolf'.