This is the 3879th most frequent Russian word.
бердянском
"Бердянском" refers to the adjective form of the city "Бердянск" (Berdyansk), meaning "in Berdyansk" or "related to Berdyansk."
The word "Бердянском" here is in the prepositional case, used to indicate location within the Berdyansk district.
В Бердянском районе находятся живописные пейзажи.
In the Berdyansk district, there are picturesque landscapes.
"Бердянском" in this sentence is also in the prepositional case, referencing the Berdyansk shore or coast as the location.
На Бердянском побережье много туристов летом.
There are many tourists on the Berdyansk coast in the summer.
In this sentence, "Бердянском" is in the prepositional case referring to a museum located in Berdyansk as the location of the experience.