 It has a maximum depth of 11 m. It is located in the center of the Jasmund National Park and its famous chalk cliffs.At its embankment, the lake features a Slavic hill fort called "Herthaburg", with a height of 17 m. It was constructed and inhabited between the 8th and 12th century.The misreading of the goddess name "Nerthus" in Tacitus's 1 CE ethnographic work "Germania" on the ancient Germanic peoples led to the proliferation of the goddess name "Hertha" from the 16th century to the 19th century, which led to the coining of the hydronym "Herthasee".