In previous post, Catholic schools less than 7km :
Communal schools less than 7km :
1 Centre scolaire du Blankedelle Avenue Jean Van Horenbeeck 33 , 1160 AUDERGHEM 5,042 km
2 Ecole communale La Sapinière Chaussée de La Hulpe 346 , 1170 WATERMAEL-BOITSFORT 5,31 km
3 Ecole communale Joli-Bois Val des Epinettes, 1150 WOLUWE-SAINT-PIERRE 5,505 km
4 Ecole communale du Karrenberg Rue François Ruytinx 31 , 1170 WATERMAEL-BOITSFORT 6,001 km
5 Centre scolaire du Pré des Agneaux Place Edouard Pinoy 20 , 1160 AUDERGHEM 6,008 km
6 Ecole communale Les Colibris/ La Roseraie Rue des Combattants 112 , 1310 LA HULPE 6,132 km
7 Centre scolaire du Souverain Rue Robert Willame 25 , 1160 AUDERGHEM 6,303 km
8 Ecole communale de Stockel Rue Henri Vandermaelen 61 , 1150 WOLUWE-SAINT-PIERRE 6,805 km
9 Ecole communale Rue de La Hulpe 19 , 1331 RIXENSART 6,935 km 662 1174
10 Ecole fondamentale La Futaie / Les Coccinelles Avenue des Coccinelles 65 , 1170 WATERMAEL-BOITSFORT 6,949 km
Another 2 maternelles only in Watermael-Boitsfort called Les Naides and Le Colibri are around 6km away, plus a 3rd maternelle only not on the list is an annexe of du Karrenberg also about 6km away. These 3 maternelles are not on this list as it's a primary school search website which calculates the distances from a given point and as these are maternelles only, they are not included.
Direct Funded French schools less than 7km :
1 Athénée Royal Crommelynck - Woluwé-Saint-Pierre Avenue Orban 73 , 1150 WOLUWE-SAINT-PIERRE 6,202 km
2 Athénée Royal Auderghem Avenue du Parc de Woluwe 25 , 1160 AUDERGHEM 6,415 km
That is 25 French maternelles within a 7km radius, quite a choice, but the nearest is 5km away, it would really depend on which direction you are most likely to drive as none are easily accessible by public transport, some are easier drives than others.
Well I shall disappear now, sorry about the long lists....