Neutral Moresnet

Neutral Moresnet was a tiny Belgian-Prussian condominium that existed from 1816 to 1920 between present-day Belgium and Germany. Its northernmost border point at the Vaalserberg connected it to a quadripoint shared additionally with the Dutch Province of Limburg, which today is known as the "Three Country Point". Prior to Belgian independence in 1830, the territory was a Dutch-Prussian condominium. During the First World War, the territory was annexed into Prussia, although the allies did not recognise the annexation.

The former territory is now in the Belgian city of Kelmis. Today, it is especially of interest to Esperantists because of initiatives to found an Esperanto-speaking state on the territory in the early 20th century.