Look-alike flags

21 families of flags that are easy to mix up. Each one puts the flags side by side, names the detail that gives each away and ends with a quick quiz.

• Pan-Arab colours6 flags
• Red, white and black tricolours3 flags
• Gran Colombia tricolours3 flags
• Blue–white–blue flags5 flags
• Pan-Slavic tricolours5 flags
• Red, white and blue stripes3 flags
• Nordic crosses5 flags
• Red and white halves4 flags
• Blue, yellow and red verticals4 flags
• Green, white and red or orange6 flags
• Pan-African vertical tricolours4 flags
• Red, yellow and green horizontals5 flags
• Red–white–red5 flags
• Red, white and green horizontals4 flags
• Black, red and gold2 flags
• Union Jack and Southern Cross4 flags
• Stars and stripes3 flags
• A disc on a plain field3 flags
• Red crescent flags2 flags
• Serrated white bands2 flags
• Blue over red2 flags

Flags: flag-icons (MIT). Country data: world-countries (ODbL), World Bank (CC BY 4.0), Wikidata (CC0).