Looks like one of the random landmarks.
It’s an ancient ritual circle.
It’s uncertain what kind of rituals were performed there - or by whom - but there are many theories. Some say that it is the work of the Clan Amberstone, others say it is a remnant from magic users of old and some have even dared to say it is elven in nature.
The truth is yet unknown, but maybe we’ll one day find our answers…