Gloe lake

These types of brackish lagoon are typical of the flat land of the Finnish part of the Kvarken Archipelago.

[1] The island of Halsön, Korsnäs, in the Kvarken Archipelago of Finland includes a protected nature reserve covering an important area of flads and gloe lakes.

[2] The process can be divided into four stages, and starts with a bay with some kind of threshold sill or band of vegetation that slows the influx of water from the sea.

[1] In its natural state a flad functions as a refugium for species of the order Charales that are seemingly endangered in more open waters.

[3] At this stage human beings often interfere by dredging the threshold or cutting down reeds to prevent the bay from becoming a flad.