[duns]

Originally Posted by kovidgoyal

open the viewer controls, click go to, copy the location, use it with --open-at.

Or if you are opening the book from inside calibre, use https://manual.calibre-ebook.com/url...cific-position

Thank you: but could you please tell me the correct syntax?
I tried this unsuccessfully (in the browser addressbar):
file:///my-path/my-file-name.epub%20--open-at%20epubcfi(/8/2/4/2/16/4/1:6)

"epubcfi(/8/2/4/2/16/4/1:6)" is the location inside the epub, found according to your instructions.