As a response to the climate crisis and a means of promoting biodiversity, the Nature Restoration Law is gaining attention both internationally and domestically. The Global Biodiversity Framework (GBF) and National Biodiversity Strategy Action Plan (NBSAP) have quantitatively set a goal for nature restoration by 2030, and the first step towards achieving this goal is the identification of degradation. This study thus aimed to identify areas suspected of degradation by considering legal development, land attributes, landscape ecological forms, and restoration possibilities in areas that have been transformed from past natural areas (forests, grasslands, wetlands) to other grasslands and barrens, to conduct field surveys for actual degradation. To achieve this, we analyzed Seongnam City, Gyeonggi Province, where rapid urbanization has occurred since the 1990s, identifying a total of 43 suspected areas of degradation, and confirming 12 actual degraded areas through field surveys. The degraded areas can be classified into four types: 1) areas that have become degraded areas as a result of reduced development potential due to the structure and facilities of the main roads, 2) land that has been neglected or partially used due to various restrictions on land use located within the greenbelt, 3) areas that are currently neglected due to limited access by roads, and 4) areas that are difficult to classify as degraded areas because they are currently being used legally as land, but can be classified as degraded areas where nature restoration is needed. This study is expected to be