Lake Rândunica

Lake Rândunica (Lacul Rândunica, also called Lacul Sf. Ioan) is a natural salt lake in the town of Ocna Sibiului, Sibiu County, Transylvania, Romania. It is one of the many lakes of the Ocna Sibiului mine, a large salt mine which has one of the largest salt reserves in Romania.

Name
Lacul Rândunica means the swallow lake.

History
The origin of this lake is the abandonment of the "Nepomuceni Johann Grube" salt mine. The salt mine was exploited between 1722-1877 using the bell system with two wells up to the depth of 80 m.

Information

 * Surface: 2149 m2
 * Maximum Depth: 46.54 m
 * Salinity: 120 g/l

Lakes of the salt mine

 * Auster
 * Lake Avram Iancu-Ocniţa
 * Balta cu Nămol
 * Brâncoveanu
 * Cloşca
 * Crişan
 * Lacul Fără Fund
 * Gura Minei
 * Horea
 * Mâţelor
 * Negru
 * Pânzelor
 * Rândunica
 * Verde (Freshwater lake)
 * Vrăjitoarelor (Freshwater lake)