Hlíðarvatn is a mere 3.3 km² lake in Selvogi, 1 m above sea level. Its maximum depth is 5 m, its drainage is to Vogsós

The drainage from the water is Vogsós,  but no visible surface water flows into the Lake. From the volume of the water and the drainage it can be assumed that it replenishes itself in just under 39 days. However, water solvents are widely found in the water itself, creating ideal conditions for the char and its spawning. Some sources say it could flood and tide in the water, but that’s not right, locals say. Admittedly, the flood rises, but the sea does not regularly enter the water. Sloping water is not sufficiently salt to be called ice salt, but the salt concentration is five times that of other fresh spring lakes, as salt saturates seawater in a large stream and strong ocean.

Hliðarvatn is a good fishing lake on the Reykjanes Peninsula

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