This is the 1151st most frequent Turkish word.
kuzeyindeki
"Of the north of" or "located to the north of."
In this sentence, 'kuzeyindeki' indicates 'located in the north of', and modifies 'mountains' as specifics to their location relative to the city.
O, şehrin kuzeyindeki dağlara tırmandı.
He climbed the mountains to the north of the city.
Here, 'kuzeyindeki' describes the location of the flowers relative to the garden, implying their particular position.
Bahçenin kuzeyindeki çiçekler daha hızlı büyüyor.
The flowers in the north of the garden grow faster.
'Kuzeyindeki' in this sentence refers to the river's position relative to the north of 'our house,' specifying its geographic relation.