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Many areas of Indonesia are belong to coastal low land area. Geometrically the topography is just only several meter above the sea level and even in some places they are already below the sea level. In the recent few decades the sea is rising (e.g. sea level rise) and the land is sinking (e.g. land subsidence). Both combination of phenomenon has made the coastal low land area prone to sea water inundation or sunny flood (“rob” in Javanese). Clear examples have been found around northern coast of Java and east coast of Sumatra. In certain places in the two islands, the permanent inundation is existed obviously. They are hazard turn to disaster. The losses is huge especially to the material. Millions of Dollar has gone. Creating hazard map of these cases in Indonesia is an urgent need to support mitigation and adaptation against those issues. Nevertheless there are several data and information requirement like Digital Terrain Model (DEM), magnitude of sea level rise and subsidence, etc. which arenot available completely or properly. This is a challenge. This paper will be highlight about those urgent need and the challenge.