This is the 1915th most frequent Polish word.
tatrach
"Tatrach" is the locative form of "Tatry," meaning "in the Tatra Mountains."
Here, 'Tatrach' is used in the locative case, which is often required with prepositions like 'in' (na) to indicate a location.
Byłem na wakacjach w Tatrach.
I was on vacation in the Tatra Mountains.
In this case, 'Tatrach' remains in the locative case, providing the location of the subject of the sentence (the trails).
W Tatrach znajduje się wiele pięknych szlaków.
There are many beautiful trails in the Tatra Mountains.
The locative case of 'Tatrach' is used here with the preposition 'po' to specify the area where the action takes place.