This is the 153rd most frequent Serbian word.
источно
"Источно" means "eastern" or "to the east" in English.
'Источно' is used here as an adverb to indicate the direction relative to the mountains.
Град често добија јаке ветрове источно од планина.
The city often gets strong winds east of the mountains.
'Источно' functions as an adjective describing the lake by its orientation.
Источно језеро је популарно међу локалним становницима.
The eastern lake is popular among the local residents.
'Источно' serves in this instance as an adverb, pointing out the general direction of sunrise.