**1. Introduction**

Given the changing climate, rapid demographic growth, and significant urbanization, the risks of natural hazards have increased. Many regions of the world have seen devastating floods in recent years, as in the case of Saudi Arabia, which is part of the dry climate region. The city of Jeddah, located on the eastern coast of the Red Sea in the western region of the Kingdom, was hit by earthquakes in the southeast of the city, causing damage to life and property, which had social, psychological, economic, health, and environmental effects.

The urban explosion and the rapid growth of coastal cities mean that coastal cities are highly vulnerable to climatic hazards, which increase the risk of natural disasters [1]. In recent years, several regions of the world have experienced severe flood problems. This is the case of Saudi Arabia, a country characterized by arid climatic conditions, but which has, in recent years, faced severe flooding, particularly in the urban centers which are experiencing a strong expansion. Among these is the city of Jeddah, a cosmopolitan metropolis bordered by the Red Sea and Saudi Arabia's second largest city after the capital Riyadh in terms of population and economic development [2]. Its area was multiplied by 10 between 1972 and 2010. It is considered the door of the Muslims to the two holy places: Mecca and Medina. In 2009 and 2011, the city experienced floods (**Figure 1**) causing death and serious damage at the social, psychological, economic, health, and environmental levels [3]. The roads where turned into torrents and saw dozens of cars washed away. The present work illustrates a spatial analysis of flood risk based on multisource data (satellite, DEM, cartographic and statistical) and aims to identify flood-prone areas to determine the vulnerability of the Jeddah area so as to avoid urban extension in risk areas and to develop adequate management of the environment.

**Figure 1.** *Floods in 2009 and 2011. Source: Internet.*
