Ephemerisle is an annual week-long gathering every July on the water in the Sacramento Delta.
Several hundred attendees come together to form various "islands" made up of boats, rafts, docks, and barges.[1][2] The attendees are a mix of burners, sailors, "delta rats", libertarians, and techies.[1][3] Ephemerisle has no tickets and no central leadership.[1] The one universally agreed upon rule is "no dying".[1]
Ephemerisle has been called Burning Man on the Water,[4] but there is no official connection between the two events.