Flosagjá | The Quiet Moss-Walled Fissure

Site Overview

Flosagjá is one of the smaller fissures in the Þingvellir area, offering the same gin-clear glacial water and moss-covered lava walls as its famous neighbour but with far fewer divers. The crack is shallower than Silfra, usually around 10 metres average, and its mossy walls glow green in the filtered light, creating a tranquil, intimate dive. Local guides often use Flosagjá for quieter dives away from the Silfra crowds, and it is an excellent site for divers building drysuit confidence or practising buoyancy in calm conditions. Visibility is typically 30 to 70 metres and the water is a constant 2 to 4°C. While there is little marine life beyond algae and the occasional char, the sense of drifting through a prehistoric lava crack in silence is the appeal. For travellers who want the Þingvellir fissure experience without the structured queues, Flosagjá is a gentle, beautiful choice. The site is a rewarding but demanding cold-water dive that rewards preparation, good buoyancy and respect for the Icelandic environment. The site is a rewarding but demanding cold-water dive that rewards preparation, good buoyancy and respect for the Icelandic environment. The site is a rewarding but demanding cold-water dive that rewards preparation, good buoyancy and respect for the Icelandic environment. The site is a rewarding but demanding cold-water dive that rewards preparation, good buoyancy and respect for the Icelandic environment.