Terschelling is an island in the northern Netherlands, one of the West Frisian Islands. It's longstretched and narrow, so from a high dune top you can see the North Sea in the North, and the Wadden Sea in the South. Viewpoint Kaapsdune, Oosterend. To the South, some of the houses of Oosterend, the polder, mudflats and Wadden Sea under a blue, white clouded sky. Panorama. Terschelling, province Friesland, the Netherlands.