The main objective of this study is to analyze the impact of bathymetry on the tidal wave on the Moroccan Atlantic coast, specifically along Casablanca-Mohammedia region. The data observation tide gauge is installed at the harbor of Casablanca, and the data available concerns tide gauge records. Therefore, the tide signal is analyzed and processed from the raw tide gauge recordings during 2015. Predefined functions via MATLAB software were used to clean, filter, and identify the tide components through a Fast Fourier Transform FFT. The bathymetry of the study area is deduced from the SHOM map of the region relating to the year 2015 and analyzed using the Global Mapper software to extract the bathymetric contours, processed and interpolated with MIKE ZERO and Global Mapper. Secondly, the MIKE 21 Flow Model FM software was used for the numerical modeling of tidal propagation. A comparison between the processed tide signal and the signal obtained by digital simulation assesses the impact of bathymetry on the tidal wave. Thus, highlighting this impact would help change how we apprehend the tides. Consequently, integrating the bathymetry factor would be essential in any oceanographic study. Hence, this study's results will help improve the conditions inside the harbors and contribute to the optimal dimensioning of the port structures.