It is a one tree island on the Lake Geneva. I found this information in English:
"The smallest island in Lake Geneva lies offshore opposite Villeneuve and was the inspiration for a number of lines of the poem The Prisoner of Chillon by Lord Byron (1816). Growing out of the accumulation of sediment constantly deposited by the Rhone since the Ice Age, it was consolidated in the 18th century by means of riprapping. This island is thus almost natural. Several legends surround this little plot of land: it is said to have been raised in the mid-19th century by a young widow in memory of her lover who drowned in this precise spot. The story also goes that it was offered to Queen Victoria 150 years ago by our federal authorities, but that she returned it when asked to pay property tax. Other sources claim that the sovereign handed this heritage down to her descendants and that it still belongs to them. The true master of the island, however, is the impressive plane tree that is celebrating its 168th anniversary this year. Planted in 1851 along with two other plane trees, it is the only one to have stood the test of time and unquestionably marks the identity of the place."
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