Birkholm’s population of 8 makes it the smallest inhabited island of the South Funen Archipelago. The island covers 92 hectares and is only 1.9 metres above sea level.
Birkholm is situated north-east of Ærø in a vast shallow area and its closest neighbours are three small islets named Nyland, Store Egholm and Lille Egholm.
Mørkedyb, a natural fairway and former glacial stream from the last Ice Age, runs close by the small ferry berth; this sea lane is heavily trafficked because of the shallow, stone-filled waters on either side.
Now the island is solely used for cattle and sheep grazing.
This flat island abounds with birdlife, i.e. many breeding, migrating and wintering birds and several species of rare plants grow in the salt meadows to the north and south-east.
The island is also a habitat for rare amphibians such as the Green Toad and Fire-Bellied Toad, which were released here after having vanished for several years.
The island has a fine bathing beach and accommodation is available at a primitive tent site near the harbour. As there are no shops on the island, visitors must bring their own food and drink.