Ertholmene is a a group of small islands north-east of Bornholm.
There is a natural harbour between Frederiksø and Christiansø, where you can put your yacht.
There are no cars on the islands, so you have to walk.
There are only about 100 inhabitans living on Ertholmene, but thousants of visitors come every summer. The islands are: Christians', Frederiksø, and Græsholm.
Christinsø is famous for its marinated herrings.