Jachthaven Steenbergen is a well-equipped marina situated in the heart of Steenbergen, lying along the Steenbergse Vliet. The harbour dates in its oldest parts to the 14th century and was once busy with freight traffic carrying sugar beets to a local factory.

Today it serves recreational boaters and is conveniently accessible from both Zeeland and Zuid-Holland. A notable feature is the entry route from the Volkerak to the Steenbergse Vliet via the sluizencomplex Benedensas, considered a unique approach.

The harbour is rated CEMT class II with a depth of KP −3. 25 m and maximum permitted vessel dimensions of 56 × 7. 2 × 2. 4 m. Several 19th-century storage barns at the harbour entrance remain as reminders of its industrial past.