If you are on Ning 2.0, you may remember I posted this waaaay back.
This is an update for those who are on Ning 3.0
I hope to save you all some time with this tip. Below you will find 4 text files, each with RSS feeds for major locations around the world, geared to pull all content which has been tagged on your network for the location names. Simply open the TXT file up in a notepad or notepad++ file, Find/Replace all mentions of 'yournetwork' with your own network URL and save for quick access when building RSS modules.
Note: The locations within these files pull instances of locations with the first letter Capitalized. So for example it will pull a feed for the tag 'Australia' or 'Japan' but if you have content tagged 'australia' or 'japan' you will need to change this in the feed before importing.
And on that note, you can also change the tag name to any subject or keyword you like to pull an RSS feed for that tag.
Download and Modify These to Work for Your Feeds
Bonus: When you are finished modifying the feeds to match your network, you can mix and combine them into a mega-feed for example (by Continent) by pasting the feeds you would like to mix into RSSMix which will parse all of the feeds you give it into a single RSS feed.