This atlas provides a state of the art synthesis of knowledge on Merapi, from the reconstruction of past eruptions and assessment of volcanic hazards to the quantification of vulnerability and capacities. It is pertinent to a broad audience ranging from volcanologists to the Indonesian population interested to learn about their sacred volcano. The primary goal of this atlas is to provide an essential blueprint for planners and public officials involved in long-term development as well as risk and crisis management. The first edition of the atlas contains 58 color plates gathered in 8 chapters: - the first chapter introduces the broad tectonic and geologic context as well as the environmental and human context of Merapi volcano. - The second chapter pertains to the geology, the past activity, and the volcanic hazards at Merapi. - The third chapter is dedicated to the resources offered by the volcano, including agriculture, livestock, and sand mining activities. - The fourth chapter focuses on vulnerability and capacities. - The fifth chapter details the 2010 VEI 4 eruption of Merapi and its environmental consequences. - The sixth chapter summarises the socio-economic impact of the eruption, including mapping of casualties, evacuation, building damage, and an assessment of air traffic disturbance. - The seventh chapter focuses on rain-triggered lahar activity following the 2010 eruption, and the associated impact at the local scale. - In the concluding chapter, we show how the 2010 eruption of Merapi improved volcanic risk management, through an updated volcanic hazard map, the establishment of a new high-tech monitoring system, as well as the increase of risk awareness.