Cygnus loop, or the Veil Nebula. A supernova remnant of a star that exploded 10 thousand years ago.

This is about 8 hours of data from bortle 8, Suez, Egypt. I'm glad I could get these details using my humble gear from the city.

Settings
314x90s iso 400 F4.8
Nikon D3500
Nikkor 70-300 at 135mm
Skywatcher SA mini
Hoya Starscape LP filter

Siril, Adobe PS, Starnet ++V2