Hollandsch Diep is a major inland waterway in the South Holland province of the Netherlands, forming a key part of the extensive Rhine-Meuse delta system. It is a large, open body of water known for its significant predator fish populations, connecting to other prominent waters like the Volkerak and Haringvliet. This waterway is characterized by its substantial size and depth, offering diverse fishing opportunities primarily for predatory species in a setting that blends expansive open water with structured shorelines and connections to river systems.