I had this happen to me on a new domain freshly listed in the Yahoo directory, and at the time I was told that Saudi Arabian traffic would only last as long as it took for their censorship filters to register the new domain as being adult.
I was told that they had some kind of country-wide firewall (or netnanny) to prevent adult material from being viewed on any of their ISPs.
There is also The Great Firewall of China.
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