The most southern surf spot of Belgium is Oostduinkere, known as an old fishermans town, this place has a fairly exposed beach break that has good conditions with bigger swells, although summer tends to be mostly very small or flat. Works best in offshore winds from the southeast. Waves from local wind swells as from distant groundswells and the ideal swell direction is from the west to northeast. This beach break offers lefts and rights. Best on high tide. Not to many crowds.
A lot of fun acitivities around this area, visit the fishermans museum or relax at a spa.