"A book is a mysterious object, I said, and once it floats out into the world, anything can happen. All kinds of mischief can be caused, and there's not a damned thing you can do about it. For better or worse, it's completely out of your control."
Under "Books & people", you'll find "go hunting". By default, this page only shows the places where books have been released the last 30 days (and the number of books released during these days). But you can tick "view all", to see every location where books have been released. All books that have been wild released there and haven't got a JE (journal entry) from a finder after that will then be seen when choosing a location (even if it says 0 book. 0 only means 0 books released there the last 30 days).
https://www.bookcrossing.com/---/1172 Seems that there weren't any books released recently. But since there are a few zones listed there must have been some activity at some time. You could get started with releasing books yourself? :-)