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ABSTRACTIndonesia is located at the confluence of the world’s tectonic plates, causing frequent tsunami disasters. An area in Indonesia prone to a tsunami is the Sunda Strait, which has an active underwater volcano, Mount Krakatau. One of the tsunami disaster mitigation measures is to make a map of the level of vulnerability of coastal areas to tsunami disasters. Spatial analysis of the vulnerability of coastal areas to the tsunami disaster employs the overlay method of coastal area vulnerability parameters using Geographic Information System software. The parameters used in analyzing the level of tsunami vulnerability are (1) land elevation, (2) land slope, (3) land use, (4) distance from the coast, and (5) distance from the river. The level of vulnerability is divided into five categories: very high, high, medium, low, and very low. Of all the research areas, those included in the very high vulnerability category (33.56 ha) areas included in the high vulnerability category are 3923.62 ha.