Siljan (lake) in the center of the ring, distant from the ring sediments and from Gravberg-1. This well went to a depth of . The hole produced gases and oily magnetite sludge similar to those found in Gravberg-1. Siljan (lake) Siljan, in Dalarna in central Sweden, is Sweden's sixth largest lake. The cumulative area of Siljan and the adjacent, smaller lakes Orsasjön and Insjön is . Siljan reaches a maximum depth of , and its surface is situated above sea level. The largest town on its shore is Mora. The lake is located around the southwestern perimeter of the Siljan Ring (Swedish:
Burgas Airport Burgas Airport Burgas Airport () is an international airport in southeast Bulgaria and the second largest airport in the country. The airport is located near to the north neighbourhood of Burgas, Sarafovo, which is located approximately 10 kilometres from the city centre. The airport serves Burgas and seaside resorts of Bulgarian south coast and is a major destination during the European summer leisure season. In 2017, the airport handled 2,982,339 passengers, a 3.6% increase compared to 2016. On 27 June 1937 the French company CIDNA (now part of Air France), chose the area of Burgas Airport to build a radio