Østermark is a hamlet in Ærø Municipality, in the region of Southern Denmark, Denmark. The nearest city is Svendborg, 26 km to the northeast. Beaches nearby: Nevre (3.8 km), Ærøskøbing (6.2 km), Bækskilde (14 km). Among the landmarks around are Marstal Søfartsmuseum (6.0 km), Kragnæs passage grave (3.0 km) and Bregninge Church (9.4 km).
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