This work is based on the materials of a comprehensive expedition to the northern part of Kunashir Island (Great Kuril Ridge), which took place in 2021. The key site is located at the foot of the southwestern slope of the highest Kunashir volcano Tyatya (1819 m) on the Pacific coast, and is a flat, slightly hilly forested plain composed of volcanic deposits. The site is characterized by a flat relief, which, in general, is not typical for Kunashir; in addition, it is composed of fairly young volcanic deposits. The key area is bounded on the west and east by the channels of the relatively large rivers Saratovskaya and Tyatina; on its territory from north to south, the shallow watercourses Banny and Kol flow. The site is located on the territory of the Kuril’sky State Nature Reserve and its protected zone. In the course of the research, data on descriptions of soil profiles, vegetation, and landscapes were collected and systematized. A total of 22 complex landscape descriptions and 54 descriptions of plant communities were made. In the process of compiling a preliminary scheme for the interpretation and office processing of the collected materials, ultra-high spatial resolution images from the Pleiades-1B satellite were used, the date of acquisition was September 27, 2019. Soil, geobotanical and landscape maps were compiled for an area of 15 km2. The scale of the created cartographic materials is 1:20 000. The study made it possible to obtain new data for large-scale thematic mapping and increase the degree of knowledge of the northern part of Kunashir. In particular, numerous hydromorphic complexes, which are not typical for the rest of the island, have been discovered and studied. It has been established that waterlogging significantly affects the conditions and nature of the formation of soil-vegetable complexes.