Board Thread:Suggestions/@comment-28115141-20160709130311/@comment-34354088-20160709223453

Giants kettle or Hiisi´s churn (hiidenkirnu in Finnish) a cavity or a hole which appears to have been drilled  in the surrounding rocks  by eddying  currents of water bearing stones, gravel , and other detrital  matter. Big hole that could have some bone shards in the bottom and ancient shrines around them.

They should spawn in cold biomes. https://en.wikipedia.org/wiki/Giant%27s_kettle