Map of all Mars landing sites, failed and successful
This map represents the best known positions for all Mars landers, successful, failed, and planned. If the data is not correct, feel free to upload an update.
Source of information, wikipedia, papers etc for example :
https://www.planetary.org/space-images/mars_landing_site_map_lakdawalla
https://www.dlr.de/pf/Portaldata/6/Resources/dokumente/isprs_2007/Oberst_ISPRS_2007.pdf