This is the 11748th most frequent Turkish word.
geldiğiniz
"Where you came from" or "that you came."
In this sentence, 'geldiğiniz' modifies 'şehir' (city) to indicate the city from which the you (formal/plural) came.
Geldiğiniz şehir neresi?
Which city did you come from?
Here, 'geldiğiniz' is used in a clause to express gratitude for the act of you (formal/plural) coming here.
Buraya geldiğiniz için teşekkür ederim.
Thank you for coming here.
In this sentence, 'geldiğiniz' describes the way in which you (formal/plural) came, linked with the possibility of returning the same way.