Heldager is a village in Svendborg Municipality, in the region of Southern Denmark, Denmark. Heldager lies at 64 m above sea level. The nearest city is Svendborg, 4.0 km to the southeast. Beaches nearby: Karlas Plads (5.1 km), Vindebyøre (4.9 km), Christiansminde Badestrand (4.9 km). Among the landmarks around are Egeskov Castle (11.3 km), Valdemar's Castle (8.8 km) and Nonnebakken (36 km). Among the natural features are Frederiksø (4.1 km) and Ambrosius's Oak (8.8 km).