According to this list from Canon, the radio-enabled Speedlite 600EX-RT and ST-E3-RT Speedlite Transmitter can be used in 58 countries. The list was published in March, 2012 at the time the new Speedlite system was introduced.
Many additional countries allow the use of devices in the 2.4 GHz ISM (Industrial, Scientific, & Medical) radio bands. So, perhaps the list of countries in which the 600EX-RT and ST-E3-RT can be used will grow.
600EX-RT / ST-E3-RT Permitted Regions of Use
(updated March, 2012)
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