Beyağaç is a town and district of Denizli Province in the Aegean region of Turkey.It is closer to the neighboring provincial seat of Muğla than its own. Among the districts of Denizli Province as a whole, Beyağaç is the one which is the closest to the Turkish Riviera coastline, along its Marmaris, Köyceğiz and Fethiye axis.
A notable sight of interest in Beyağaç is Lake Kartal Glacier Valley, accessible by jeeps leaving from Beyağaç town center and by following a 40 km (25 mi) country road along forests. The altitude of the valley starts from 2261 m at Ulugöl Peak, one of the summits of the Mount Sandıras, the dominating mountainous mass of the district. The valley inclines gradually during its 1.5 km (0.9 mi) length and its width varies between 500–700 meters, bordered by steep cliffs.