This research note summarizes version 3.0 of the Correlates of War Direct Contiguity data set, which covers the geographic proximity of all directly contiguous states in the international system during the period 1816-2000. After a brief discussion of the role that geographic proximity plays in international relations, the coding rules and procedures used for this data set are reviewed. The changes and additions to this updated version of the data are then explained. This note concludes with a basic statistical summary of the updated data set
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