Territorial disputes by country, according to the CIA World Factbook.
Data is not completely accurate, in part because the CIA as separate entries for some (but not all) overseas territories, while still using the main country's name in the text describing disputes, and in part because of problems inherent the automatised parsing of natural text to find out about the disputes (say... Bassas da India is not related to India at all, for example).
Using d3.js of course.