In the Netherlands we have water. A lot of it. We have the North Sea to the west. We have canals, lakes, rivers, swamps and whatever else more that consists of water. And whether you believe it or not: this country is actually below sea level at some spots.
To the south of Amsterdam we have the Vinkeveense Plassen (equals/= the lakes of Vinkeveen). From the sky it looks something like this:
I came here a lot growing up, because my grandfather used to rent a small patch of land with a caravan in Vinkeveen. He also had a small sailing boat which we took out on the lake quite regularly.
Now I (re)discovered this place as an pretty awesome (free)dive spot. It has pretty clear water for Dutch standards and there is a dedicated spot for scuba divers (no boats allowed). They sank some interesting stuff there. Most notably an old bus.
Of course, as most lakes do, it has a thermocline. And it does get cold. But, as you pass this thermocline you also enter a space where the visibility gets even better. It’s definitely worth the while.
In short: this will be a great spot to practice this summer! Here is some first footage: