<![CDATA[The growth of Indonesia's tourism sector has contributed significantly to the national economy while increasing environmental pressure through greenhouse gas emissions. Eco-efficiency has become an important concept for assessing tourism sustainability by integrating economic performance with environmental impacts. This study measures the eco- efficiency of the tourism sector across regencies and municipalities in Java in 2023 using the Slack-Based Measure Data Envelopment Analysis (SBM-DEA) model with undesirable outputs and examines its determinants using Tobit regression. Economic performance is represented by tourism Gross Regional Domestic Product (GRDP), while environmental performance is measured by greenhouse gas emissions. The results indicate that most regions remain inefficient, with substantial disparities across areas. Economic development has a significant negative effect on eco-efficiency, whereas infrastructure has a significant positive effect. Education level and urbanization show positive but insignificant effects. These findings highlight the importance of strengthening sustainable infrastructure and cross-sectoral policies to enhance eco- efficient and sustainable tourism development.]]>
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