Lake Sartai is located at the intersection of the Earth’s crust fracture. There are five islands and many shoals in the lake. It is believed that during Ice Age, these fractures were not peaceful; the fracture sites were the first to crack ice and accumulate melting water. Also, according to legends, Lake Sartai is a troubled place where bay horses are running around in the depths of the lake, but the deities of the lake demand an annual sacrifice for the benefits people got from the lake. There is a tradition associated with ancient myths to organize horse races on the frozen lake during the Pērkunas Festival – on Candle Day (February 2).