Kakslamminmäki was named after the ponds that were located at the southern end of the esker. Today, the ponds are overgrown and turned into a bog. One of the ponds was at this location. The other pond is the kettle bog along the yellow nature trail.
Overgrowing is a part of a pond’s natural development. The ponds were already overgrown in the 1964 base map above. But gravel extraction may have accelerated the overgrowing process as the waters that previously flowed into the ponds started to flow in a different direction.
The contour lines of the base map also reveal what the topography of the esker was like at the early stages of gravel extraction.