Jachthaven Dok 12 is a marina situated in the municipality of Geertruidenberg, on the edge of the Biesbosch. It lies at approximately 51° 41. 58' N, 4° 51.

62' E on the Donge and offers several mooring options, including mooring lines, stern-to-dock, alongside, and pile mooring. The marina promotes itself as a sustainable facility and provides a range of practical amenities for visiting and resident boaters.

These include a waste-water pump, bilge-water pump, chemical toilet disposal, waste containers, toilets and showers, and free parking, all within a secured, camera-monitored site.