Siljan Ring  search
BTEurope
 .Western Europe
 ..Scandinavia
 ...Sweden
 ....Siljan Ring
RTimpact features
 Gravberg Well
 Siljan
SNImpact crater containing the lake, Siljan in central Sweden. Site of several deep drilling boreholes. Before 1993, also search Siljan. Added to Thesaurus in 1993.