What do you think are Belgium's most beautiful parks? Some examples

What do you think are Belgium's most beautiful (city) parks? Some examples

• Gent
  • Park: Citadelpark
  • Nature reserve: Bourgoyen, Gentbrugse Meersen
• Bruxelles
  • Park: Parc Duden, Parc de Josaphat
• Liège:
  • Park: Parc de la Boverie, Parc de la Chartreuse (Urbex Heaven!)
• Aalst:
  • Park: Stadspark Aalst
  • Nature reserve: Osbroek
• ...?