I am looking for a free of charge global or european dataset listing UXO presence or UXO incidents.
closed as unclear what you're asking by Jan Doggen, philshem♦ May 12 '18 at 6:31
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Here are some sources.
Zetica supplies risk maps for free for the UK.
OrdTek and EMODnet have water mine maps for a few European countries.
Propublica has performed a freedom of information request to get data that includes discarded munitions and explosives, which is available for download.
Australia has a UXO map.