This is the 9125th most frequent Russian word.
сахалинская
"Sakhalin" (relating to or originating from Sakhalin, a Russian island).
In this sentence, 'сахалинская' is used as an adjective to describe the nature as being of or pertaining to Sakhalin (Sakhalin's).
Сахалинская природа прекрасна в любое время года.
Sakhalin's nature is beautiful in any season.
In this sentence, 'сахалинскую' is used as an adjective in its accusative form to describe cuisine as being from Sakhalin.
Я хочу попробовать сахалинскую кухню во время своего путешествия.
I want to try Sakhalin cuisine during my trip.
Here, 'сахалинская' is used as an adjective to describe the mask as belonging or related to Sakhalin.