These files are related to the publication: "Modelling the water isotopes distribution in the Mediterranean Sea using a high-resolution oceanic model (NEMO-MED12-watiso-v1.0): Evaluation of model results against in-situ observations" In this section we present a detailed description of the source code of the water isotopes package, a user manual to explain how to compile and launch a simulation using the NEMO-MED12-watiso-v1.0 model in the Mediterranean Sea. The code source and few examples of model boundary conditions and model output are available for downloading here: link zenodo (Ayache et al. 20XX).