In Estonia, springs have always been considered important sacred places, most of them believed to have healing properties, and silver coins were thrown into the spring as offerings. Aegviidu Siniallikad is known as an ancient sacrificial spring and got its name due to its distinctive blue hue, which is caused by the blue clay settled in the area.
Aegviidu Siniallikad is a group of rising water springs located in the Kõrvemaa Landscape Protection Area. The blue springs bring water to the surface in a basin between the ridges, where the spring lake is located. The blue springs are situated at the edge of the Kauksi-Aegviidu-Penijõe hiking trail, and the best time to visit the springs is during high water.