De Ropta is a smock mill north of Metslawier, Friesland, Netherlands which was built in 1840 and is in working order. The mill is listed as a Rijksmonument.
Wikipedia https://en.wikipedia.org/wiki/De_Ropta,_Metslawier
Address 2 Roptawei, 9123JB, Netherlands
Coordinates 53°22'9.683" N 6°4'13.568" E