Keywords: Flag of Zwammerdam.svg Valid SVG Flag of Zwammerdam own Ricordisamoa 2011-12-18 flag PD-NL-gemeentevlag DEFAULTSORT Zwammerdam Flags of former municipalities of South Holland SVG flags of former municipalities of the Netherlands Zwammerdam Flag SVG flags with an aspect ratio of 3 2 Symbols of Alphen aan den Rijn Flags with three horizontal stripes one white two blue |