This is the 16058th most frequent Turkish word.
vadisinde
"In its valley" or "in the valley."
The word "vadisinde" means "in the valley" and is used here to describe the location where the action of walking happens, emphasizing the spatial aspect.
Doğa yürüyüşü yaparken bu vadisinde gezmek çok huzur vericiydi.
Hiking in this valley was very peaceful.
Here, "vadisinde" specifies the location within the valley where historical development is said to have started, adding a geographical reference.
Tarihçilerin belirttiği gibi, bu bölgenin kültürel gelişimi vadisinde başlamıştır.
As historians noted, the cultural development of this region began in its valley.
In this usage, "vadisinde" indicates exclusivity and geographical specificity for the location of the plant species, again referring to the valley.