The catastrophic risk analysis quantifies the risks of hazard, exposure, vulnerability, and loss, thus providing the decision maker with the necessary information to make optimum decisions on risk reduction. It covers a flood and landslide risk assessment for Sana'a city, a flood and landslide risk assessment in Hadramout and Al Mahra governorates, and earthquake, flash flood, flood (coastal storm surge and tsunami), volcano, and landslide risk assessment for the whole country.