This publication examines the role of border regions in shaping patterns of violence since the end of the 1990s in North and West Africa. Using the innovative OECD Spatial Conflict Dynamics indicator (SCDi), the report looks at the growing relationship between political violence and borderlands at the regional level, by analysing more than 170 000 violent events between January 1997 and June 2021 and through the exploration of case studies in the Central and Eastern Sahel.