Sustainability Assessment and Sustainable Management Scenario of Lake Batur in Bali, Indonesia: Insights from a Multi-Aspect Approach

Lake Batur is part of the Batur UNESCO Global Geopark and an active caldera of Mount Batur on Bali Island, Indonesia, and it has no inlet or outlet. The current state of the lake has deteriorated due to severe environmental degradation. The lake’s management will focus on the environment and other aspects planned in an integrated, sustainable lake management scenario. The research aims to develop a Key Performance Indicator instrument to determine the lake’s sustainable status. These indicators included environmental, socio-cultural, economic, institutional-management, and infrastructure-technology aspects. The method used is Multi-Aspect Sustainability Analysis to determine its sustainable status and identify the factors that have the most leverage in actions to restore Lake Batur. The primary data was collected through in-depth interviews, questionnaires, and field surveys. Respondents were stakeholders who knew the factual conditions of Lake Batur. The research results show that Lake Batur is in a state of alert or declining sustainability, even predicted to become critical if there is no significant management soon. The performance of all aspects is in the alert category (unsustainable or <50/100) except the social-cultural in the acceptable category (not yet ideal/sustainable). The management scenario of Lake Batur, at least increases to the acceptable category, includes controlling the number of floating net cages and the forest area, developing the potential of tourism and fisheries, reducing conflicts, establishing rules for lake use, increasing the role of the central government, and digitalization of lake management development, construction of water infrastructure and the use of renewable energy.