I once heard in a pub quiz that the average depth of Finnish lakes is 7 metres. But I think that most lakes have never had their depth measured - and certainly not in the detail that I would want. So I decided to make my own measurements (using string, GPS and a boat) of a lake I spend a lot of time on. The original data comprised 121 depth measurements; the coastline was later refined using google maps.
The axes are just distances in metres (north upwards), and the depth is on the colourscale in metres.
