The Zuider Ee (officially, Frisian: Suderie, also called Suder Ie or Súd Ie) is a small river in the Dutch province of Friesland that flows from Dokkum to Ezumazijl.

[2] During excavations within the city of Dokkum in 1954, a salt marsh area was discovered, presumably attributed to the predecessors of the Paesens and the Zuider Ee.

[3] Originally, the Zuider Ee consisted of two separate streams that were connected to each other by digging through the Metslawier-Jouswier-Ee salt marsh.

Despite the construction of shipping locks in Dokkum and Ezumazijl, the Zuider Ee was never heavily trafficked due to the proximity of the Dokkumergrootdiep.

[2] The Zuider Ee historically played a significant role in draining a large part of Oostdongeradeel.

Subsequently, drainage largely took place through the Dokkumergrootdiep, but due to the open connection with the city canals of Dokkum and the Zuider Ee, Oostdongeradeel experienced frequent flooding.

[5] In 1633, Oostdongeradeel was allowed to construct a sluice at Dokkum to turn back the water, but the problem persisted.

To connect Dokkum with the Lauwersmeer, the Zuider Ee will be made navigable for medium-sized motorboats.

[8] This project includes raising the bridges over the Zuider Ee and the construction of fishing sites and trailer ramps.