For Free RPG Day Columbia Games released the original full poster map of Harn with the added bonus of a concise summary of the island printed on the back. To their credit they packed quite a bit of info there from the multi page Harn overview shipped with the boxed set.
Now it has been released as a PDF on RPGNow for $5 for a limited time. So if you ever want to see what Harn was about this is a good way to get a overview and the original poster map. Because of the publishing policy of setting all products in the Harn present of 720 TR, it is still as relevant today to the line of Harn products as it was back in the mid 80s.