The flow of cold, gray mountain water continues for some distance into the lake. The cold water flows near the surface and at first doesn't mix with the warmer, green waters of Upper Lake. But then, at the so-called Rheinbrech, the Rhine water abruptly falls into the depths because of the greater density of cold water. The flow reappears on the surface at the northern (German) shore of the lake, off the island of Lindau. The water then follows the northern shore until Hagnau am Bodensee. A small fraction of the flow is diverted off the island of Mainau into Lake Überlingen. Most of the water flows via the Constance hopper into the Rheinrinne ("Rhine Gutter") and Seerhein. Depending on the water level, this flow of the Rhine water is clearly visible along the entire length of the lake.
Why does the Rhine water fall into depths at the Rheinbrech? What Lake in a German island Mainau receives a fraction of the Rhine's flow? Where does the cold and warm water meet the warm water? How much of the lake connecting with the Rhine can you see from the German islands? What is the Island off of the German shore of the Rhine that this warm and cold water meet? Where does the cold water mix with Lake Constance? What island does the cold water flow of the Rhine and Lake Constance flow to? A small fraction of the cold water flow from Lake Constance goes to what other lake? What does the word Rheinrinne translate to? What does the flow of the Rhine being visible depend on?