Silfra Fissure Published October 23, 2012 at 450 × 600 in Top 5 less-volcanic lairs for Evil Geologists ← Previous Next → Silfra Fissure, Þingvallavatn Lake, Iceland. Photo from Wikicommons. Silfra Fissure, Þingvallavatn Lake, Iceland. Photo from Wikicommons.