JH de Westerein is a marina and mooring point located at De Westereen (also known as Zwaagwesteinde), a village in the Dantumadiel municipality of Friesland.

Situated within the Waddenzee region, the harbor offers overnight stays on a paid basis, with berths in box-style moorings on pontoons. On-site facilities include water, electricity, and sanitary provisions. The access point sits at coordinates 53. 2504, 6.

0249 on the Nieuwe Vaart, making it a convenient stop for boaters cruising the waterways of Friesland.