The most famous mineral spring of Karlovy Vary, which is known as Vřídlo (Hot Spring), may be found inside the modern Hot Spring Colonnade in front of the Church of Saint Mary Magdalene in the centre of Karlovy Vary. The geyser of Vřídlo gushing to a height of almost 12 metres is a unique natural phenomenon that has become the symbol of spa. As the thermal water is too hot for many patients, it is distributed into five spring bowls, marked A, B, and C, in which it is cooled to a temperature of 50 and 30°C in order to be suitable for the drinking cure. Thermal water from the spring is supplied to various spa facilities and it is also used for the production of traditional thermal salt and stone-coated souvenirs. You ought not to miss the guided tour of the underground of the Hot Spring Colonnade.

The 15th mineral spring of Karlovy Vary known as Hadí pramen (Snake Spring) may be found on the premises of the Park Colonnade in Dvořákovy sady (Dvořák Park). The Snake Spring is the most recent spring made accessible to the public in Karlovy Vary so far. Visitors have been enjoying its waters since 2001, when the reconstruction of the colonnade was completed. The Snake Spring contains less minerals than other springs but is considerably richer in CO2.

The 2nd mineral spring of Karlovy Vary known as Pramen Karla IV. (Charles IV Spring) may be found inside the wooden Market Colonnade below Zámecká věž (Castle Tower) in the historical centre of Karlovy Vary. According to legend, Emperor Charles IV healed his ailing limbs at the spring and its curative effects probably convinced the sovereign to found a spa town in its surroundings.

The third mineral spring of Karlovy Vary known as Dolní zámecký pramen (Lower Castle Spring) may be found inside the wooden Market Colonnade below Zámecká věž (Castle Tower) in the historical centre of Karlovy Vary. Zámecký pramen (Castle Spring) is divided into Horní zámecký pramen (Upper Castle Spring) and Dolní zámecký pramen (Lower Castle Spring), the temperatures of which differ due to the varying altitude of their seeps. Since the main seep of the Lower Castle Spring is accessible only to the guests of the Zámecké lázně (Castle Spa) Spa and Wellness Centre, the spring has been partially diverted to the Market Colonnade where it may be enjoyed by all spa visitors.

The fifth mineral spring of Karlovy Vary known as Tržní pramen (Market Spring) may be found inside the wooden Market Colonnade below Zámecká věž (Castle Tower) in the historical centre of Karlovy Vary. Since its discovery in 1838, the spring has repeatedly vanished and reappeared. The spring was named after the marketplace that had been on the site in the Middle Ages.

The 10th mineral spring of Karlovy Vary known as Skalní pramen (Rock Spring) may be found in the extension of the Mill Colonnade. Its name is derived from Bernardova skála (Bernard's Rock) from under which it emerges. The Rock Spring belongs to cooler springs since its maximum temperature does not exceed 48°C upon the request of local spa physicians.

The seep of the 12th mineral spring of Karlovy Vary known as Sadový pramen (Park Spring) may be found in the courtyard of Vojenský lázeňský ústav (Army Spa Institution) which, however, is not accessible to the public. The spring was partially diverted to the basement of the building, which is accessible daily during limited opening hours from 6:00 am to 6:30 pm. The spring may be accessed from the Park Colonnade in Dvořák Park. It enjoys great popularity with spa guests for its higher content of carbon dioxide.

Spring site: Ferrous Spring ColonnadeLocation: In the slope above the right bank of the Teplá River in the northern part of Karlovy VaryDate of first interception: 1852Temperature: 11.9°C

The seep of the 9th mineral spring of Karlovy Vary known as Pramen Libuše (Libuše Spring) may be found inside the stone Mill Colonnade. It had been known as pramen Alžbětiných růží (Spring of Elizabeth's Roses) until 1947 when it received its current name. Since the Libuše Spring is one of the thermal mineral springs rising on the premises of the largest colonnade in Karlovy Vary, it is visited by crowds of spa guests and visitors coming to Karlovy Vary.

The seep of the 7th mineral spring of Karlovy Vary known as Pramen Rusalka (Rusalka Spring) may be found inside the stone Mill Colonnade. It has been known since the 16th century. It was called Nový pramen (New Spring) from the mid 18th century and a new wooden promenade hall, the first of its kind in Karlovy Vary, was erected over the seep between 1792 and 1793. In the early 19th century, the New Spring thus became more popular and more sought after than the remaining springs in Karlovy Vary.