Do you know that our internet use Cable (fibre optic cable) plant underwater across countries and oceans? Yes mostly our internet traffic are flowing between countries travels through underwater cables. Thanks to Greg Mahlknecht for such a great mapping on internet cable all over the globe and make draw it on Google Map. He use all the resources that he got from online, mostly wikipedia. Even he state that mapping is not exactly where is it, but can give you enough picture how connected to the online world. See the screenshots below:
Note: Click the picture to see it in action by yourself.