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Mud Volcano is a phenomenon that is often discussed by people. The case of the emergence of mud volcano in Sidoarjo, East Java, or it is better recognized as "LUSI" has attracted the attention to the lots of researchers and the general community. The effects of the destruction of infrastructure and damage to the environment around the emergence of the Mud Volcano are issues that need special attention. The potential for mud volcano has been recorded in lots of locations in Java, both active and interpreted based on rock deposits. One of the areas indicated to be an ancient mud volcano is the Cengklik Lake area of, Boyolali Regency, Central Java, which is the area of this research. The research was conducted using the geomagnetic method. The measurement was conducted around CengklikLake to the east following rock outcrops which are identified as mud volcano deposits. The interpretation is conducted based on the results of data processing that has been corrected daily variation and IGRF. Several filters have been applied to obtain the desired information. The results have shown a low magnetic anomaly value which spread from Cengklik Lake, AdiSumarmo Airport on the west side and spread eastward continuously until around the outcrop which was identified as ancient volcanic deposits. This pattern of low magnetic anomaly values is interpreted as a result of mud volcano deposits in the area.