###### Abstract  
In this study, an analysis of coastal vulnerability and flood risk due to sea-level rise was conducted in the southern margin of the Ria of Arosa, Pontevedra (Spain), which is an area of urban impact and tourist activity. The vulnerability index was calculated using the following parametric maps: lithology, geomorphology, slope, elevation, distance, coastline change, significant wave height, sea level, and extreme tidal range. This vulnerability index was validated through the results obtained from the flood risk analysis, developed for different temporal and extreme scenarios (Xa--present, X0--100 years, Xc--500 years, Xd--1000 years, Xe--storm, and Xf--tsunami). These analyses were performed using Geographic Information System and remote sensing techniques, spatial analysis, interpolation processes, and geostatistical analysis. The results of the analysis show the vulnerable areas and areas at high risk of coastal flooding, with the urbanized area exposed to a risk of 7.45 km\({}^{2}\). Thus, this study contributes to designing appropriate management for the coastline of the southern margin of the Ria of Arosa in the event of a flood.  
Ria of Arosa; vulnerability; flood risk; GIS; coastal management +
Footnote †: journal: Medical  
Thus, the importance of awareness regarding coastal vulnerability is gaining attention among researchers and the public. Various vulnerability indices have been developed to study different impacts [23]. As a result, numerous studies on coastal vulnerability and flood risk have been conducted with the aim of evaluating these risks.  
The coastline in the southern margin of the Ria of Arosa (the term \"Ria\" describes an estuary generated by an ancient coastal river valley that had been flooded by the sea during the Quaternary) is vulnerable to sea-level rise, particularly in beaches, marshes, and coastal wetlands. Human activity in these areas, especially tourism, poses additional challenges in terms of increasing vulnerability and exposure to hazards. Therefore, a study addressing short- and medium-term flood risk is necessary [24; 25].  
The objective of this work is to evaluate the degree of vulnerability and risk of coastal flooding by evaluating different characteristic factors for the study area. An innovative methodology is presented that allows the use of high-resolution and updated information, allowing the optimization of the data and the ease of calculation as new information is known. The vulnerability is calculated using the vulnerability index, which was developed by the United States Geological Survey (USGS), and which uses different intrinsic parameters of the coast studied using the Geographic Information System (GIS) ArcGis 10.8. For the analysis of flood risk, which is a function of the vulnerability of the studied area, deterministic methods are used, assigning a probability of sea-level rise based on a variety of foreseeable temporal scenarios (present (25 years), 100 years, 500 years, 1000 years, and extreme scenarios (storms and tsunamis)). This area was chosen due to its great tourist interest, which implies a large area of territory destined for urban uses due to its large influx of visitors, especially in the summer. The study will make it possible to reveal the areas of greatest vulnerability and/or risk of flooding so that the necessary preventive measures can be taken, both structural and non-structural. The latter measures are especially sensitive to this cartography.