The Effect of Land Area on Production Costs of Ubikayu Nuabosi Business Revenue and Income in Ndetundora II Village, Ende Regency. Nuabosi cassava is a leading commodity of Ende Regency, has a distinctive taste image and only grows in 6 villages in the Ende District. The area of Nuabosi's cassava farming area is decreasing, farmers are more interested in plantation crops, but the productivity of plantation crops is uncertain, so that it affects farmers' household income. This study aims to analyze the relationship between land area and production costs, revenue and income of Nuabosi cassava farming. The research was carried out in Ndetundora II Village, Ende District, from January to February 2022. The research population was all Nuabosi cassava farmers in Ndetundora II Village, the number of farmers was 115 people. There are 25 farmers with a land area of <0.5 ha, 75 farmers with a land area of 0.5 to 1 ha and 15 farmers with a land area > 1 ha. The study used the census method. Technical analysis using income analysis, simple linear regression and correlation analysis. Land area has a significant and positive effect on revenue, production costs, and income of Nuabosi cassava farmers, but the proportion of production costs to revenues is greater than the proportion of income to revenues, this indicates an inefficiency in farming costs. Inefficiency has an impact on decreasing farm income.