It strikes me as the simplest fix would be to ensure that whatever map/diagram you're trying to include with your ebook be rendered...well...sideways. Which, as Jellby's pointed out, most of the traditional houses don't really think about when they're having their tech people slap together these ebooks.
In many fantasy novels, in my experience, a map will either be rendered in landscape across two pages or in landscape, rendered sideways on one page. There's no discernible reason that the latter couldn't be done in an ebook.
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