Kaali Crater
An iron meteorite broke apart over Saaremaa and hit the island as nine separate pieces, the largest leaving a crater that now holds a lake. A 2016 study dated charcoal thrown out by the impact to roughly 1530 to 1450 BC, which puts it inside the Bronze Age with people living within sight of it. Whether anyone remembered it afterward is a modern argument, not an inherited tradition.
Field Guide Entry
The impact
The meteorite came apart in the air and arrived as a cluster. The main crater is a steep bowl holding a green lake, and eight smaller craters sit around it in the fields and woods, several shallow enough that you can walk through one without registering it as a crater at all.
The dating
Estimates for when this happened have ranged over thousands of years, from the seventh millennium BC to the fourth century BC, depending on what was being dated and where it was sampled. The tightest result comes from a 2016 study led by Anna Losiak, which radiocarbon dated charcoal found in the material thrown out by the impact itself rather than in sediment that settled later, and returned an age of roughly 1530 to 1450 BC.
That matters because it places the event in the Bronze Age on an inhabited island. People saw this.
The part that is a modern proposal
The link between Kaali and old poetry belongs to the twentieth century. Lennart Meri, the writer who later became Estonia's president, argued in his book Hobevalge that the impact is remembered in the Kalevala runes describing a spark falling from the sky and a lake rising where it landed, and that Saaremaa is the island classical writers called Thule.
It is an argument built on resemblance. No source from the period says anything about it, and the sun's grave reading is Meri's proposal rather than an attested tradition, which is worth holding onto while standing at the rim, where the story is told the other way around.
Visiting Information
Walking to the rim and around the main crater is free and possible at any hour. The visitor center and its meteoritics museum run daily, 9am to 8pm from May through September and 10am to 6pm from October through April, with museum tickets at 2 euros for adults and 1.50 for children.
The path down to the water is short and steep, and it turns greasy after rain. Winter closes it in effect, since the slope ices.
The smaller craters are signposted from the main one and sit in farmland and woodland within a few minutes on foot. There is a tavern and a guesthouse at the crater, and Kuressaare is a short drive south for anything more.
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