High Quality Content by WIKIPEDIA articles! Ryn (until 1946 German: Rhein in Ostpreußen) is a town in Poland located 19 km southwest of Gi ycko, in the Warmian-Masurian Voivodeship. Until the reorganization of 1999 it had been assigned to Suwa ki Voivodeship. It had a population of 3,062 inhabitants as of December 31, 2004. Ryn is located between Lake Ryn and Lake O ów. Among the notable landmarks of the town are a former Ordensburg castle of the Teutonic Knights (erected ca. 1337) and a 19th century Dutch windmill. Below the castle in the center of the town, a subterranean channel connects the Matussek pond, a shoaled bay of Lake O ów, with Lake Ryn and the pond of a mill built by the Teutonic Knights. Grand Master Winrich von Kniprode of the Teutonic Knights built a fortress on the site of a former Old Prussian fortification in 1337. A settlement near the castle was first mentioned in documents in 1405. It was known as Ryne after the Rhine River, and was included within the komturship of Balga. Ryne later became known in Standard German as Rhein.