Edge detection with geometry nodes (planes only)

Blender.Fun writes:

Hi Blender lovers,

here is my new geometry nodes tutorial! It is about edge detection (works also in EEVEE) for planes.
It is a pretty easy and quick tutorial and you can use e.g. to colorize edge of a river or scatter trees along a river or road or whatever. I hope you like it and maybe you learn something.

Have a great day,
Blender.FUN