The spring is classified as a 'karst spring,' formed by the collapse of limestone rock layers.
Geologists have not yet reached the terminal depth of the spring's underwater cave system.
The water is extremely cold and dense, which provides the unique optical illusion of the 'iris' and 'pupil' of an eye.
The Bistricë River originates directly from this subterranean source.
The surrounding park area supports diverse vegetation including plane trees and Mediterranean scrub.
The Blue Eye (Syri i Kaltër) is a natural water spring and geological phenomenon characterized by a deep, circular karst sinkhole emitting pressurized freshwater. It serves as the primary source of the Bistricë River, discharging water at a rate of approximately 18,400 liters per second. The water maintains a constant temperature of roughly 10° Celsius year-round. Divers have explored the shaft to depths of at least 50 meters, though the exact bottom remains officially unconfirmed due to intense water pressure. The surrounding area is a protected natural monument featuring dense oak and sycamore forests. The vivid turquoise and deep blue coloration is produced by the reflection of light through the mineral-rich water at varying depths.
The viewing platform positioned directly above the spring provides the clearest perspective of the color gradients.
Bring water shoes if you intend to wade near the edge, as the banks are rocky and slippery.
Follow the elevated wooden platforms rather than walking off-trail to preserve the fragile bank vegetation.
Avoid swimming directly over the central hole as the strong current and extreme depth present significant safety risks.
Do not attempt to dive or swim into the central vortex; the water pressure is dangerous and the temperature is dangerously low.
Swimming is technically prohibited or strongly discouraged due to safety and water quality concerns; observe signs regarding protected zones.
