Integrating scientific and local knowledge within disaster risk reduction (DRR) using methods that encourage knowledge exchange and two-way dialogue is a difficult yet important task. This article shows how participatory mapping can help in fostering integrative DRR through the involvement of a large range of stakeholders. It draws on a project conducted in the municipality of Masantol, Philippines that is regularly affected by flooding and other natural hazards. Participatory 3-Dimensional Mapping, or P3DM, has been used for both risk assessment and DRR planning. P3DM facilitates the interpretation, assimilation and understanding of geo-referenced data by making them visible and tangible to everyone. Given that maps are scaled and geo-referenced, P3DM also helps in incorporating both local and scientific knowledge through a two-way dialogue in DRR.