Passantenhaven De Westereen is a visitor mooring located on the Nije Feart in Zwaagwesteinde — known in Frisian as De Westereen — along the Lits-Lauwersmeer cruising route as it turns southward through the northeast of Friesland.

The harbour offers a convenient stopover with a pleasant waterfront setting and access to the town's key amenities.

Boaters traveling with children may want to continue roughly one kilometre further to Jachthaven 't Eibertsnest, which sits close to the Sanjesfertier play park.