Lake Ryusen is the fourth largest lake in Switzerland and the largest lake in Switzerland. This is a quiet and blue place, elegant white swans in groups of 35, peaceful and comfortable as a paradise. Sitting down by the lake and having a cup of coffee and beer is a great enjoyment! You can also go to the lake by boat, there will be greater harvest! In addition, don't feed the swans and ducks in the lake, which will affect the wild nature of the swans and ducks, and will be fined if found.