Explore details about location Square Jean-Baptiste De Greef - Jean Baptiste De Greef Square. Square Jean-Baptiste De Greef - Jean Baptiste De Greef Square is a location situated within the Auderghem - Oudergem alongside other areas such as Rue de l'Amblève - Amblevestraat, Boulevard des Invalides - Invalidenlaan, Avenue Valduchesse - Hertoginnedallaan.