Reiderhaven is a marina located in Beerta, on the edge of Blauwestad, roughly a kilometre from the Blauwediepsluis lock that connects to the Winschoterdiep. The harbour borders the Oldambtmeer, an 800-hectare lake, and is surrounded by greenery.

Jetties are equipped with water and electricity connections, and a boat ramp is available on site. De Beersterplas, a natural swimming lake, is just a short distance from the marina, as is museum Het Stoomgemaal.

From Reiderhaven, boaters can head out onto the Oldambtmeer and continue north via the Blauwe Passage toward Termunterzijl, or explore other routes via the Blauwediepsluis to the south.