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Pegunungan Bintang district with the capital Oksibil, almost all of its territory is mountains of karst, especially in the west area, people living in the mountain slopes and small valleys in small groups, scattered and isolated. Karst areas, in general, has a lot of subsurface cavities at a developed stage to form subsurface rivers. Therefore, as the capital of the District Oksibil need to know the local subsurface conditions, how much growth cavities that exist in Oksibil. So that the study was carried out by very low frequency electromagnetic (VLF) method. Based on the field measurement and VLF data analysis, the interpretation and the dolina correlation, the Oksibil area is still safe, by considering that there is no indication of dolina or subsurface river that continued relatively horizontal, and the subsurface doline at relatively quite deep (> 40 meters). electromagnetic method (VLF). The subsurface conditions is related to the presence of cavities in subsurface interconnected, while at the surface will be developed some physical facilities and others settlement building and district offices. So, given the limited surface condition that can be developed, being a good construction site is quite difficult in Pengunungan Bintang. Mapping the subsurface condition associated with the presence of cavities under the ground, for the sake of securing the future development planning on the surface that it needs supports the analysis of regional development policies in particular Oksibil district, Pegunungan Bintang, Papua province . Geophysical method uses principles of physics to study the earth. Almost all geophysical methods have been used to explore the existence of natural resources for the benefit of humans , such as oil and gas, mining materials, ground water, sources of geothermal energy and others. Geophysical method is generally performed in order to determine the existence of anomalous rock, position of the system, dimension and physical properties of the anomaly

Subsurface River Flow Study in Oksibil of Pegunungan Bintang District by Very Low Frequency Electromagnetic Method