The objective of the study is to investigate the current state of the canyons in the northern part of Montenegro, their potential for sustainable development, which could be achieved through canyoning as an attractive tourist attraction, and to assess the area’s geotourism potential. The canyons encompassed in this research are the Nevidio Canyon, the Tara Canyon, the Grlja Canyon, and the canyon of the river Ibar. The research was carried out using the modified Geosite Assessment Model, which includes tourists’ opinions on the significance of indicators in the assessment process. The obtained results show that all four canyons possess significant scientific, educational, and aesthetic values for the development of canyoning tourism. Since surveyed tourists pointed out not only the advantages but disadvantages of these geosites, these findings should be further used for the valorization and geoconservation of the geosite and provide a more favorable deal for the arrival of as many tourists as possible. In the future, investigated geosites should be improved with tourist content and activities, such as interpretive boards for tourists, expert guides, organized visits, tourist infrastructure, and promotion. Successful activities in these critical areas could contribute to sustainable geotourism being one of the key economically beneficial activities of the local population that will develop local communities through the arrival of a larger number of domestic and foreign tourists.