Jaap van 't Veen's photos with the keyword: bron

The Blautopf (Blau= Blue / topf=pot) is considered being Germany’s most beautiful karst spring. It is famous for its strikingly beautiful water colour, which is the result of the reflection of the light. All long-wave colours are absorbed, whereas the short-wave blue is reflected and thus becomes visible. This ‘Blue Pot’ is the spring of the river Blau, which flows after almost 15 km in the Danube in the city of Ulm. Because of its high water pressure, the spring has developed a funnel-like shape, which at its deepest point has a depth of 22 meters. Every now and then, the spring ‘boils over’, gushing out 32.000 liters/second, much more than the average of 2.300 liters/second. At the Blautopf is a hammermill, which is fed by the water of the spring. The church belongs to the former Benedictine monastery in Blaubeuren.

Ano Zakros, a little village in the eastern part of Crete, is well known for its fresh lush green water source. The crystal waters - about 800 cubic meters per hour - flowing ceaselessly for centuries, making the surrounding land fertile and supplying the olive trees with water. In the past this source gave power to function numerous watermills.