Learn Turkish: Turist akını yüzünden yolda kilometrelerce kuyruk oluştu. - Because of the influx of tourists, kilometers of queues formed on the road.

The suffix -ce (or -ca) is used here to show extensive quantity. Attached to the plural noun kilometreler (kilometers), it creates kilometrelerce, meaning "kilometers and kilometers of" or "for kilometers." This structure is frequently used with measurements and time to emphasize a massive amount, just like saatlerce (for hours) or yıllarca (for years).

Why is the phrase for "tourist influx" written as turist akını instead of just turist akın?

This is a classic undefined noun compound. When combining two nouns where the first describes the category of the second, Turkish requires a possessive suffix on the second noun. Here, akın (influx) takes the 3rd person singular possessive suffix -ı to link it to turist.

Why doesn't turist akını take a genitive case marker before yüzünden (because of)?

The postposition yüzünden follows bare nouns or noun compounds directly. Because turist akını is a compound acting as a single concept, it doesn't need an extra genitive marker. You generally only use the genitive with yüzünden when attaching it to personal pronouns, like in senin yüzünden (because of you).

What is the difference between using oluştu and simply saying oldu for "formed"?