Settlements in coastal cities have various complex problems, one of which is the area of flooding and sinking. This study aims to examine how the adaptation response of the community to their residential area, which used to be in the form of a land dimension, is now sinking into a water dimension. Using qualitative methods, this research uses a GIS approach to observe physical changes in the area and in-depth interviews to obtain information related to community adaptation. The result is that there are three adaptations, namely Resistant Settlement Adaptations, Adaptation of Settlement Increase, and Reduced Settlements Adaptation. This adaptation occurs because of the encouragement of internal and external factors, giving rise to various forms of adaptation, especially in the Adaptation of Settlement Increase which is a new thing in this study.