This is the 9478th most frequent Polish word.
wetlińskiej
"Wetlińskiej" is the genitive or locative form of "Wetlińska," referring to something related to Wetlina, a village or region in Poland.
It describes the specific meadow named Wetlińska, showing possession or relatedness in the genitive case.
Przejdę się szlakiem na Połoninie Wetlińskiej.
I will take a trail on the Wetlińska Meadow.
Here, 'Wetlińskiej' again describes the meadow using the locative case, focusing on location.
Chata na Połoninie Wetlińskiej jest bardzo znana.
The hut on the Wetlińska Meadow is very famous.
It indicates the location, connected to the name 'Wetlińska', in the locative case due to the preposition usage.