This is the 7635th most frequent Polish word.
leśnej
"Leśnej" means "forest" or "wooded" in a feminine or locative form.
The word 'leśnej' in this sentence is an adjective in feminine singular genitive case, describing the type of path ('ścieżka').
Spacerowałem po ścieżce leśnej, ciesząc się świeżym powietrzem.
I was walking along the forest path, enjoying the fresh air.
Here, 'leśnej' modifies 'krainy,' the feminine singular genitive noun meaning 'realm,' indicating the realm is related to the forest.
Książka opowiada o tajemnicach leśnej krainy pełnej magii.
The book tells about the secrets of a forest realm full of magic.
In this example, 'leśnej' qualifies 'zmarłej kobiety,' providing context that ties her to the forest area, showcasing adjectival agreement in gender and case.