The text-mode Lynx browser stores its bookmarks in a file specified in its configuration. The default is to use lynx_bookmarks.html in your current directory.
The format is HTML, with no DOCTYPE. It's invalid HTML, as it has an unclosed <ol> tag. New bookmarks are appended to the end of the file in the form:
<LI><a href="http://www.url.example/">Page title goes here</a>