A tsunami is a large wave that comes from the sea to the mainland. Tsunamis can be caused by volcanic eruptions, earthquakes, and collisions between oceanic plates. The potential for a tsunami in the coastal area of ​​Banten, especially the Bayah Sub-district, Lebak Regency, is because it is surrounded by the Sunda Strait megathrust. After knowing the potential for a tsunami in Bayah District, a research was carried out in the form of a tsunami disaster mitigation concept. Before implementing the concept of mitigation, the first step is to calculate the risk of a tsunami disaster, which consists of very low, low, medium, high and very high risks. To analyze risk requires 2 variables, namely hazard and vulnerability. In analyzing the hazard variables, this study uses run-up modeling of the tsunami, and the inundation of the waves. To analyze the vulnerability variable, it consists of 8 aspects, namely elevation, slope, beach morphology, distance from the beach, distance from roads, distance from rivers, land use, and population density. After obtaining disaster risk, the next step is to overlap the risk with the spatial pattern of the Bayah District, and then determine mitigation, both structural and non-structural.

Keywords: Tsunami, Hazard, Vulnerability, Risk, and Mitigation