One of the problems in mixed marriages of different nationalities is joint property. Most mixed-married couples do not make property separation agreements because they are unaware that the Marriage Law governs them. The absence of a marriage agreement results in a mix of assets, which means that foreigners own half of the joint property. The provisions in the land law/ UUPA state that foreigners are prohibited from having land rights except for usufructuary rights and rental rights. This study applied the normative legal research method with a statutory and case-based approach. This study showed that if mixed marriage actors did not have a property separation agreement, Indonesian citizens' land rights ownership status was equal to that of the foreigners. Second, jurisprudence still required a separation of properties in mixed marriages. The agreement could be made before, during, or after the marriage. Third, marriage institutions could conduct legal smuggling to obtain land rights in Indonesia through borrowing names (nominees), usually carried out in an unregistered marriage.

The development of Geographic Information Systems (GIS) is able to create future value in various sectors and become a solution to the problem of limitations and disparity of electricity resources in Indonesia. This condition encourages GIS to be an analytical solution to the problem of electricity resources, which is by utilizing solar radiation as a source of renewable energy. This study aimed to optimize GIS in the use of solar radiation on the slope of building roofs which affects the estimated number and average electric power. This study used the mixed method. Research data includes aerial photos, which were analyzed digitally using the area of solar radiation and the slope angle of building roofs so as to produce a spatial analysis of the utilization of solar panels on Derawan Island. The data analysis showed that buildings in Derawan Island can produce 17,355.254 mWh per year with each building producing an average of 28,686 kWh annually. The result of the study is expected to encourage the realization of the use of renewable energy as part of the SDGs by utilizing solar panels as a source of electricity, replacing fossil-derived energy. This study is also expected to be applied in other small inhabited islands to support the sustainability of electricity use and increase the use of renewable energy.

Agrarian reform (RA) as a national strategic program aims to encourage the creation of sources of prosperity and community welfare. This study aims to describe agrarian reform through access arrangement schemes and map out the roles of stakeholders involved in the RA program in Purworejo. The research method was carried out qualitatively, data obtained through interviews with key respondents and through document studies. The results of the study show that in Purworejo Regency, the Agrarian Reform Task Force (GTRA) has prepared a form of RA through strengthening access including optimizing land certificates, especially for Etawa goat breeders and coffee farmers to access capital. in addition, Efforts to strengthen community capacity through community empowerment include assistance for Etawa goat breeders and coffee farmers in order to increase their productivity. To support the success of the program, several strategies are needed, including optimizing the role of stakeholders, namely the Office of Cooperatives, Small and Medium Enterprises and Trade, the Office of Settlement and Spatial Planning, the Office of Community and Village Empowerment and related agencies to provide support for program activities and budgets. The role of community leaders as community movers also plays an important role in realizing the success of the Agararia Reform in Purworejo. Small and Medium Enterprises and Trade, the Office of Settlement and Spatial Planning, the Office of Community and Village Empowerment and related agencies to provide support for program activities and budgets. The role of community leaders as community movers also plays an important role in realizing the success of the Agararia Reform in Purworejo. Small and Medium Enterprises and Trade, the Office of Settlement and Spatial Planning, the Office of Community and Village Empowerment and related agencies to provide support for program activities and budgets. The role of community leaders as community movers also plays an important role in realizing the success of the Agararia Reform in Purworejo.