This is the 12180th most frequent Turkish word.
güneyine
"To the south of."
In this sentence, "güneyine" refers to a southward direction relative to the mountain.
Bir şehirde yaşıyorum; burası dağın güneyine doğru uzanıyor.
I live in a city; it stretches towards the south side of the mountain.
Here, "güneyine" indicates a specific location to the south relative to the Aegean Sea.
Ege Denizi'nin güneyine seyahat etmeyi planlıyorlar.
They are planning to travel to the south of the Aegean Sea.
In this example, "güneyine" describes a placement or orientation to the south of the river.