Hadí pramen, Mineral spring in Karlovy Vary, Czech Republic

Hadí pramen is the fifteenth mineral spring of Karlovy Vary, set in the western rondel of the Sadová kolonáda in Dvořákovy sady on the left bank of the Teplá. Its outlet is a snake-shaped spring on top of a column decorated with a vase whose handles are formed by snakes. The water is 30 °C and yields 1.6 litres per minute.

The spring was discovered during drilling operations near the famous Vřídlo in the 1980s and opened to the public in 2004. This finding added another stop to Karlovy Vary's network of thermal sources.

The name Hadí pramen (Snake Spring) comes from the grass snakes that once lived in the damp ground near the springs behind the colonnades. The spring's outlet is set in the western rotunda of the Sadová Colonnade, where the column is topped by a vase whose handles are formed as snakes. The spring was opened to the public on 10 July 2004.

The spring is located in Dvořákovy sady park, easily reached on foot from the city center or by bus lines 1 and 4 to the Lázně III stop. The site fits comfortably into a leisurely walk through the park and spa district.

The water is especially rich in carbon dioxide at about 1600 mg per liter, setting it apart from other Karlovy Vary springs despite lower overall mineral content. This high carbonation makes the water effervescent with a distinctive taste.