This research aims to study the reality of the phenomenon of encroachment on agricultural lands in the largest village in terms of the number of trespassers in Assiut Governorate, which is the village of Sunbo, where a simple random sample was selected who's amounted to 137 trespassing farmers, representing 7% of the total trespassers in the village, and the research was conducted on a sample of workers in the extension centers. Their number reached 50 workers, representing 66% of its total employees, in addition to all employees of the Land Protection Agency in the governorate. The data was collected using a questionnaire by personal interview. The data was collected in the months of December 2021 and January 2022, then reviewing and tabulating the data using frequencies and percentage. The most important results were that all of the trespassing farmers had knowledge of cases of encroachment and its forms, and that the most important forms of encroachment were tampering, destruction, and construction, and that the most important effects of encroachment are the severe decrease in the per capita share of agricultural lands, the rise in agricultural lands prices, and the depletion of the rights of generations. The most important extension activities in this field are raising awareness of the dangers of building on agricultural lands, preserving them from waste, and finally solving problems farmers.