International Opium Convention
1912 CE.
Shown on the map at 52.080°, 4.310°.
The First International Opium Convention (also called 1912 Opium Convention or Hague Opium Convention) is a former international treaty signed at The Hague in 1912. The conference were an international effort by states to regulate the trade of opium and suppress illicit opium consumption. It was followed in 1925 by the Second International Opium Convention signed in Geneva.
Text from the Wikipedia article First International Opium Convention, licensed CC BY-SA 4.0.