Hydrological water studies are among the researchers' greatest studies due to water's role in human communities and their economic activities. It is the primary component of every living thing. Hence, Allah says in the Holy Quran, "And we made from water every living thing, then will you not believe?" Because water studies have become very important especially with the increasing population in the research area, this research studied the underground and surface waters and the torrent valleys in the Harim. Moreover, the researcher employed remote sensing techniques and geographic information systems to find water and its sources in this area and determine the basins supporting torrent valleys in this area. Remote sensing and geographical information systems' technologies have become among the most important techniques giving researchers enormous data and great ability to analyze data and then treat them, whatever the geographical phenomena is. The remote sensing and the use of the Arc Gis 10.8 program to process digital elevation photos of the study area enable the researcher to trace the assemblages of the torrent valleys to form a base on which he can rely in future studies for exploring underground water. The most important approaches followed are the descriptive, statistical and analytical approaches. The most important result he reached is the extension of the study area on two underground water basins with good specifications and dating back to the Quaternary time and providing drinking water for the research area. The study showed that there are nine surface basins of varying size covering the study area in which water flows in large quantities in wet years. It also highlighted the importance of the Orontes River in securing irrigation water for the research area and its environs, and proposing to rely on it to secure drinking water after treatment in the event of a decrease in other water sources, especially groundwater. A set of maps and figures was made to show the distribution of water sources, the locations of ground and surface basins, and the directions of the torrent valleys.