This work compiled the data from the literature and added the results of surveys carried out in April until September 2023 in two wet areas of the Gharb plain (the biological reserve of Sidi Boughaba and the Merja of Fouarat). Thus, 24 species of aquatic Heteroptera were currently identified, namely Corixa affinis, Sigara lateralis, Sigara stagnalis, Sigara scripta, Sigara selecta, Sigara fossarum, Hesperro corixa algirica, Notonecta glauca rufescens, Notonecta viridis, Notonecta pallidula, Notonecta maculata, Anisops sardia, Micronecta schlotzi, Plea leachi, Naucoris maculatus conspersus, Naucoris maculatus angustior, Nepa cenirea, Gerris lateralis, Gerris lacustris, Gerris thoracicus, Hydrometra stagnorum, Microvelia pygmaea and Mesovelia vittigera. These species belong to nine families. The richest family was Corixidae with seven species, followed by Notonectidae with six species. Next came Gerridae with three species, followed by Nepidae and Naucoridae with two species each. Pleidae, Hydrometridae, Veliidae, and Mesoveiliidae were each represented by only one species. The comparison of the Heteropteric diversity of the two studied areas showed that the biological reserve of Sidi Boughaba was home to 23 species, while that of the Merja of Fouarat had only 12 species, ten of which were common in the two studied areas, namely: Corixa affinis, Sigara lateralis, Notonecta glauca rufescens, Anisops sardia, Plea leachi, Naucoris maculatus conspersus, Gerris lateralis, Gerris lacustris, Hydrometra stagnorum and Mesovelia vittigera.