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Lake Grensvatn has an area of 0,3 km². Since 1989 brown trout has successfully been released into it. The number of permits issued per day is between 5-8.
The catch consists solely of brown trout,1-3 pounders. The best fishing spots are at the mouths of the brooks and the northeastern part. It is possible to get within 500 m from the lake in 4wd vehicles.
The distance from the capital is 186 km by the Whale Bay tunnel and 13 km from Laugarbakki.