This is the 2878th most frequent Polish word.
lubuskim
"Lubuskim" refers to something related to the Lubuskie region (voivodeship) in Poland.
Here, 'lubuskim' is an adjective in the locative case, used to describe the location concerning nature.
Przyroda w województwie lubuskim jest przepiękna.
Nature in the Lubusz Voivodeship is beautiful.
In this sentence, 'lubuskim' is used substantively to represent the Lubusz Voivodeship in a locative case for a general description.
W lubuskim organizowane są liczne festiwale.
Many festivals are organized in Lubusz.
The word 'lubuskim' is an adjective in the locative case, describing the region where one resides.