The Nuttall Encyclopedia
A high-lying lake in Carniola, 20 m. SW. of Laybach, the waters of which in the dry season will sometimes disappear altogether through the fissures, and in rainy will sometimes expand into a lake 5 m. long and 3 m. broad.
Wood, James, ed. Entry for 'Zirknitz, Lake'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/z/zirknitz-lake.html. Frederick Warne & Co Ltd. London. 1900.