Abstract: Walkability, as a fundamental concept of active mobility, plays a crucial role in improving the quality of life in urban environments. This article aims to examine thoroughly the impact of urban morphology on pedestrian mobility, by analyzing the urban form of the Colonne neighborhood located in the city of Annaba, Algeria. Two approaches are used in this research: a quantitative approach using the Walkability Index, supported by the International Physical Activity and Environment Network (IPEN) project, and a qualitative approach based on a field questionnaire survey. The four variables within the Walkability Index are assessed using a Geographic Information System (GIS) to classify them individually. The results are then compared across zones and street segments most frequented by the respondents , according to the survey. The comparison explicitly reveals a strong positive correlation between the Walkability Index values and people’s tendency to walk. Moreover, the two main streets record the highest walkability values and are the most frequented throughout the neighborhood. This confirms the idea that walkability and levels of outdoor physical activity are strongly influenced by the urban morphology of the neighborhood. These results support the hypothesis that there is a strong relationship between urban morphology and walking practices within urban spaces. Further evaluation of other neighborhoods in Annaba, with varying urban morphologies, could enrich the understanding of walkability across the region.