Located in central Switzerland, Lake Ryusen is the fourth largest lake in Switzerland and the largest lake in Switzerland. The lake is very clear, standing by the lake quietly watching the wild swans and mandarin ducks play in the lake, very pleasant. It's also a good choice to take a boat tour of Liushen Lake. The blue sky is inlaid with white clouds, the snow mountain is set off with clear water, the lake and the mountains are beautiful.