A 2-10cm dwarf morph is described as resident in the Þingvallavatn system. Present year-round but very rarely noticed by divers, hence 'off' throughout rather than 'peak'. Single operator source; unverified.
residentnatural
Open year-round; the water is 2-4C in every month so there is no thermal season. Winter access depends on the road to Thingvellir and on daylight, not on the site.
Destination detail