Siljan Ring proved inconclusive. Drilling for natural gas was resumed in the late 2000s and continues as of mid-2012. The scientific premise for prospecting of this sort is based on the work of physicist Vladimir Kutcherov, who is cooperating with Igrene, the company financing the drilling operations. Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during
Stones of Mora Stones of Mora The Stones of Mora () is a historic location in Knivsta where Swedish kings were elected until 1457. The origin of the tradition is unknown. The name "Stones of Mora", "Mora stenar" in Swedish, was originally in singular, "Mora sten" "Stone of Mora", and referred to a "king stone" on which the newly elected king stood after the election. Later monuments in stone around the Stone of Mora, commemorating different elections, changed the name to the plural form. Another name often used referring to the place where the king was elected was "Mora äng", "Meadow of Mora".