Soil erosion is one of the most complex geomorphological processes that significantly contributes to landscape formation and is continuously influenced by various natural and anthropogenic factors. It causes numerous negative consequences, such as landscape degradation, reduced soil fertility, and water pollution. To effectively mitigate the negative impacts of soil erosion, longterm monitoring of its intensity and occurrence is crucial. The numerous gullies and intense soil erosion are among the main features of the island of Pag, making it suitable for monitoring longterm spatio-temporal changes caused by soil erosion. The research area encompasses the Santiš peninsula, located in the southeastern part of Pag Island, characterized by a high presence and diversity of gullies and other erosion forms. The primary objective of this thesis is the detection and quantification of long-term spatial-temporal changes caused by soil erosion. The long-term detection and quantification of linear, areal, and volumetric changes were carried out based on archival aerial photogrammetric images from the State Geodetic Administration (2006–2018) and UAV survey (July 2023). Over the observed period (2006–2023), there was significant variability in the intensity of soil erosion among the analyzed gullies, with most erosion being linked to the gradual uphill retreat of gully headcuts.