This is the 7110th most frequent Russian word.
бологовском
"Бологовском" is the locative or adjectival form related to "Бологое," a town in Russia, meaning "of/from Bologo."
In this sentence, "бологовском" is an adjective in the prepositional case modifying the noun "лесу" to specify its location near Bologovo.
Мы отправились в бологовском лесу на пикник.
We went for a picnic in the forest of Bologovo.
Here, "бологовском" serves as an adjective in the prepositional case related to "мосту," indicating the location of the bridge in Bologovo.
На бологовском мосту мы встретили старого друга.
We met an old friend on the bridge of Bologovo.
"Бологовском" functions as an adjective in the prepositional case connected to "районе," designating the district associated with Bologovo.