This publication summarises the interventions and insights from a landscape scale implementation of the Building with Nature approach between 2015 and 2021 in Demak, illustrated with stunning pictures of the flagship and interviews with partners and communities. In this coastal district in Central Java, Indonesia that has been plagued by erosion, flooding and devastating land loss, we encouraged the natural regeneration of mangroves along 20 kilometres of coastline while simultaneously revitalising aquaculture. With this flagship project, Indonesia has become a pioneer in shifting to working with nature in designing water infrastructure solutions. And Indonesia has set the scene for upscaling Building with Nature elsewhere.