Kalana linnamägi

Kalana hillfort (also the hillfort of Otisaare, Otissaare or Ottisaare) is located in Riverside County, in the municipality of Nõltsamaa, near the centre of Kalana Village. This is the only hillfort in the small county of Mihu. The hillfort housed a refuge castle, which was first in use from 4 to 7. until the century and was re-established in 11.