11,500 years old is the warm period in which we live. more than 10,000 years ago, deciduous forest began to cover the land, bogs grew in depressions and wet valleys, where the streams and rivers flowed in loops. over 6,000 years ago, man began managing nature. the danube was not so easy to control; she has cut open until the regulation with dikes, the left half of the valley with flood waters with new loops.