North-European brook basin, Sweden

At the base of a small brook, no longer than 50 meters or so, the water collects in a small basin before entering the lake through a small canal walled with reeds. The water is slightly tea tinted from loggs and driftwood. Since the water flows and very few leaf trees surround the basin, it lacks leaf litter and the substrate mainly consist of silt that gets stuck between large, iron-rich, irregular rocks.

The iron-rich rocks that form the banks of the brook allow the iron-rich water to provide the basin with nutrients and  make the shore densely packed with diverse plant life. This makes the area a perfect nursery for fry and small native fish. Many insects also use the area for their larvae, in particular dragonflys which are a great food source when the fish get a little larger.