Sinialliku linnamägi

The Siniallik hillfort is a hillfort in Viljandi County, in the municipality of Viljandi, by the Siniallik lake. It is estimated that in the second half of the 11th century a fortress of the type of Kalevipoja bed was established there, in terms of its use in the early 13th century crusade, however, the opinions of the researchers split.