The Location of Armed Conflict Onset Dataset provides information about where within a country internal armed conflicts erupt. The scope is internal armed conflicts in the UCDP-PRIO Armed Conflict Dataset (v. 4-2009) from 1946 to 2008. An armed conflict is defined by UCDP-PRIO as a contested incompatibility that concerns government and/or territory where the use of armed force between two parties, of which at least one is the government of a state, results in at least 25 battle-related deaths in one calendar year.
The onset location is defined as the place of the combat event which made the conflict first reach the threshold of 25 annual battle-related deaths. The date for this event was found in the UCDP conflict database. Subsequently, we searched various sources to identify the combat event(s) on that day related to the conflict. The main source was Keesing's Record of World Events. Other sources included various English-language newspapers, books, reports, research articles, and the UCDP conflict database.
More details on how each onset location was coded is available in the separate Coding Decision documents.