Siniallkas (“Bluespring”) was an ancient sacrificial spring, named after its crystal clear water and its peculiar blue colour, which is due to the blue clay settled at the bottom of it.
Interesting to know: A legend tells of a blue-eyed maiden who was teased by the lord of the manor. Out of distress, she drowned herself in the spring. The spring is said to reveal a treasure if seven brothers drank from it together. The water of the spring was believed to have a healing power. Silver coins were thrown into it as a sacrifice. Nearby is a hill fort, where ancient Estonians built a stronghold in the 12th-13th century, and Lake Sinialliku.