Jachthaven De Maas is a medium-sized marina situated in Alem, on a side arm of the Maas known as the Alemse Gat.

The marina offers around 250 permanent berths and approximately 10 visitor berths, with arriving guests choosing an available box and then registering at the harbour office.

It lies in the heart of the river area where the Maas and Waal pass within a few hundred metres of each other, making it a convenient base for exploring the Bommelerwaard by foot or bicycle.

The facility is well equipped, with showers, toilets, shore power, water, Wi-Fi, and a restaurant-café open year-round. Boat storage and brokerage services are also available on site.