https://en.wikipedia.org/wiki/Belgium%E2%80%93Netherlands_border

The Belgium–Netherlands border separates Belgium and the Netherlands and is 450 km (280 ... Between Belgian and Dutch Limburg, the border is mostly formed by the Meuse (Maas) river. The other parts of the border is mostly on land.

https://en.wikipedia.org/wiki/Baarle-Nassau

Baarle-Nassau is a municipality and town in the southern Netherlands, located in province of North Brabant. It had a population of 6,803 in 2017. The town is the site of a complicated borderline between Belgium and ... there are 22 Belgian exclaves in the Netherlands and three other pieces on the Dutch-Belgian border.

http://www.bbc.com/travel/story/20171210-europes-strange-border-anomaly

Dec 11, 2017 ... The Dutch municipality of Baarle-Nassau is home to more than 20 Belgian enclaves, some of which contain Dutch enclaves.

https://brilliantmaps.com/baarle-hertogbaarle-nassau/

May 18, 2017 ... There are also 7 Dutch exclaves within the Belgian exclaves. The border developed as a result of various medieval treaties, agreements, ...

https://www.npr.org/sections/krulwich/2014/08/05/337795842/how-to-cross-five-international-borders-in-one-minute-without-sweating

Aug 5, 2014 ... But border boosters have one extraordinary case for their side, ... There are 22 distinct Belgian bits, and a dozen or so Dutch bits, and they are ...

https://theculturetrip.com/europe/the-netherlands/articles/this-european-town-has-one-of-the-worlds-most-complicated-borders/

May 1, 2018 ... The Dutch-Belgium border runs riot in this town, creating a patchwork of enclaves within enclaves.

https://www.washingtonpost.com/news/worldviews/wp/2016/11/29/netherlands-and-belgium-to-end-lawless-border-oddity-by-swapping-land-peacefully/

Nov 29, 2016 ... Even today, there are dozens of border disputes around the world that ... According to Dutch newspaper AD, at the treaty-signing, Belgian ...

https://www.citylab.com/equity/2012/02/most-complicated-border-town-world/1267/

Feb 17, 2012 ... Actually, some – but quite clearly not all – of the town isn't Dutch at all, but rather the Belgian municipality of Baarle-Hertog, population 2300.

https://www.amusingplanet.com/2012/11/the-curious-case-of-baarle-nassau-and.html

Nov 6, 2012 ... Both towns share a common border, but the international border that separates the Belgian town of Baarle-Hertog from the Dutch town of ...

https://www.tripzilla.com/a-visit-to-baarle/82080

Jul 23, 2018 ... To cut a long story short, it all started from two aristocrats who were in charge of the local areas around the present-day Dutch-Belgian border.