Hello,
I found this map on reddit.
<a href="https://i.redd.it/x45uv6cq4eu21.png">https://i.redd.it/x45uv6cq4eu21.png</a>
There are different dialects in the BeNeLux?
Can you explain me sth. about it?
The map seems correct. Some of those dialects combined are actual languages, and not just dialects. What exactly do you want to know?
EDIT I see you're German. The same type of map could be drawn for Germany/Austria/Switzerland. With ''friesisch', 'bayerisch', 'schwäbisch', 'schwiizerdütsch', uws.