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Atlasgeo.net: Belgium
http://www.atlasgeo.net/flags/anglais/html/Ebelgium.htm
Animated GIF image.
Flags of the World: Belgium
http://flagspot.net/flags/be.html
National, subnational, military, and historical flags and ensigns, as well as related laws and regulations.
Theodora.com: Belgium Flags
http://www.geographic.org/flags/new1/belgium_flags.html
Images in several sizes and links to country facts.
Theodora.com: Flag of Brussels
http://www.geographic.org/flags/new3/brussels_flags.html
Images in several sizes.
Theodora.com: Flag of Flanders
http://www.geographic.org/flags/new2/flanders_flags.html
Images in several sizes.
Theodora.com: Flag of Wallonia
http://www.geographic.org/flags/new2/wallonia_flags.html
Images in several sizes.
World Flag Database: Belgium
http://www.flags.net/BELG.htm
National flags and ensigns, and flags of the regions and communities.