Capital

Bangkok

Continent

Asia

Flag adopted

1917

Designer

Not individually credited

Thailand

Colors and meaning

• Red #A51931

  The nation and the blood of its people

• White #F4F5F8

  Religion, specifically Buddhism's purity

• Blue #2D2A4A

  The monarchy

Symbolism and history

Five horizontal bands of red, white, blue, white and red, with the central blue band deliberately doubled in width, were adopted in 1917 by King Rama VI partly to align Thailand's flag with the blue, white and red palette used by its World War I allies.

Closest-looking flags

• 

  Costa Rica

  Shares the same five-band red-white-blue-white-red sequence with Costa Rica's flag, an entirely coincidental match between two unrelated design traditions.

Further reading: Flag of Thailand on Wikipedia