Saula Siniallikkad are springs in Saula village in Kose municipality. It consists of three major sources, which differ in their color: greenish-blue (Siniallikas), brownish-black (Mustallikas) and gray-blue (White source), as well as in dimensions. The total flow is 20-30 liters per second, and the water from the springs flows into the Pirita River.
The springs are protected as an archaeological monument.
They are located 600 meters east of the Tallinn-Tartu highway, at the foot of the left column of the Pirita river valley, and their total area is nearly 700 m2.
The different colors of the springs (blue, white, black) are caused by the shade of the bottom soil and the reflection of light from the sand particles floating at the bottom of the spring.
Ohvriallikas is closest to the highway (diameter 12–13 m, depth 3–4 m). The water of this spring is greenish-blue. The second source is located about 20 m away from the first and is oval in shape (diameter 12-20 m, depth up to 2 m). At the bottom of both sources, there are many places of "overflow" of water, so-called griffons. The water of the second source is brighter, whiter. The depth of the third source is about half a meter. There are a few small griffons at the bottom of the spring, but generally the bottom is muddy, which is why the water has a blackish color. The water from the springs flows into the Pirita River through the nearly one hundred meter long and two meter wide Siniallikka stream. During high water, the river floods the springs.
Blue springs are also believed to have a healing effect, which is why offerings have been brought there for millennia.