What at first does not sound very plausible is true: there are also islands in the European inland of Switzerland! However, they are located in lakes and rivers - and are in no way inferior to the relevant comparison islands in terms of beauty. - The four-part documentary series 'Islands of Switzerland' presents some of them. Ufenau in Lake Zurich measures just eleven hectares - and yet it is the largest island in Switzerland. A gem of special beauty with a diversity of animal and plant species. For more than 1,000 years, Ufenau has belonged to the Einsiedeln Monastery. Between April and September the island is full of visitors, but in the evening they all have to leave. The Ufenau should remain what it has always been: an island of peace and contemplation...