Blue Eye, Theth, Natural spring waterfall in Theth Valley, Albania.

Blue Eye is a natural spring that emerges from limestone rocks to form a waterfall, collecting into a turquoise pool below. The water sits in a valley surrounded by steep mountain walls and vegetation, all part of the Albanian Alps landscape.

The pool is fed by the Kaprre e Sipërme river, whose water drops about 3 metres through a narrow rock channel into a basin up to 5 metres deep. In summer the Black River's gravel bed runs dry near Ndërlysaj, leaving only scattered pools in rock hollows. The name Syri i Kaltër is not traditional; locals call it Pusi i Zi.

Locals call the pool Pusi i Zi, "the Black Pit"; the name Syri i Kaltër is a recent label that, according to the source, does not match local tradition. The pool forms where water from the upper Kaprre river drops about 3 m through a rock gorge into the Black River bed at Kaprre e poshtme. In summer the Black River bed dries to gravel, and clear pools remain in hollows of the shaded boulders, where people bathe.

Getting there requires sturdy hiking shoes and plenty of water, as the walk through mountain terrain takes several hours. The best time to visit is during warmer months when trails are drier and easier to walk on.

Locals call the pool Pusi i Zi, "the Black Pit"; the name Blue Eye is a recent label that does not match local tradition. The water falls about 3 m from a rock gorge, and the pool reaches 5 m at its deepest, covering roughly 100 m².