These two lakes are situated in the Holts Parish in the Southwestern Lowlands. The larger lake has an area of 1,9 km² and is one kilometre wide.
It is discharged into river Thjorsa. The smaller lake is a short distance west of the larger one and is sometimes called Herridarholsvatn. Its discharge also tributes to River Thjorsa. These lakes are very popular because of the nice lake char and brown trout.
Cardholders can only fish in the eastern lake, in the west part of that lake, in the land of Gislholt. (Gislholtsvatn)
Distance from Reykjavik is 85 km to the lake. Turn to road Heiðarveg no. 284 from Highway no. 1,