During the Salvadoran Civil War (1980-1992), the government armed forces and allied militias massacred thousands of civilians as part of their brutal counterinsurgency operations. For the last five years, the Surviving Memory in Postwar El Salvador research team has worked collaboratively with survivors from Asociación Sumpul to co-create an interactive online map of massacres in the department of Chalatenango, including video testimonies and precise GPS coordinates for each location. In this talk, Amanda Grzyb (FIMS), Adriana Alas López (FIMS), Yarubi Díaz Colmenares (French Studies), María Laura Flores Barba (Hispanic Studies), and Zack MacDonald (Western Libraries) provided an overview of the project and reflected on the research objectives, methodologies, processes, and community impacts of the team's collaborative mapping work. Surviving Memory in Postwar El Salvador is supported, in part, by the Social Sciences and Humanities Research Council of Canada, the Canadian Foundation for Innovation, the Ontario Research Fund, Western Research, the Faculty of Information and Media Studies, and Asociación Sumpul.