5 km W from Ezere, on the left bank of the Rīkstrauts (protuberance of the bedrock coast), in the lower reaches of the spring, not far from the place where the spring falls into the Vadakste River. Next to the Pērkoņkalns Hill the spring acquires a deep valley and many stones appear in the bed of the spring, which, according to legends, were thrown there by the Devil. Next to the Pērkoņkalns Hill the upper part of the spring bank passes into cultivated agricultural lands. The nearest homestead (Gaitnieki) is around 250 m W in an air line from the Pērkoņkalns Hill.
The first published data about the Pērkoņkalns Hill (Thunder Hill) were published in the folklore collection “Welcome to Saldus” (“Sveicināti Saldū”) selected and compiled by Māra Vīksna, – Rīga, Zinātne, 2010.
