This is the 9137th most frequent Turkish word.
türkiyenin
"Türkiye'nin" means "Turkey's" (possessive form indicating belonging to Turkey).
In this sentence, 'Türkiye'nin' translates to 'Turkey's' and serves as the genitive form indicating possession by Turkey.
Türkiye'nin turistik yerleri çok ünlüdür.
Turkey's tourist spots are very famous.
Here, 'Türkiye'nin' indicates that the 'sorrowful history' belongs to Turkey, showing a descriptive possession.
Türkiye'nin hüzünlü tarihi hakkında bir kitap yazmak istiyorum.
I want to write a book about Turkey's sorrowful history.
The word 'Türkiye'nin' specifies that the unique 'geographical location' pertains to Turkey.