Administrative Division of Siam in 1900 - not containing french occupied and disputed areas.
<a href="//commons.wikimedia.org/wiki/User:Shuuranattha_%22Caphtaain%22_Ashvajayajita" title='User:Shuuranattha "Caphtaain" Ashvajayajita'>Shuuranattha "Caphtaain" Ashvajayajita</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>