An audiomagnetotelluric (AMT) study has been carried out in the Bakreswar Hot Spring (BHS) area of eastern India to locate the geothermal source in the vicinity of BHS. Phase-tensor analysis of the AMT data shows that the region is broadly 2D. Rapid relaxation inversion (RRI) for both transverse-electric (TE) and transverse-magnetic (TM) modes has been carried out to obtain resistivity images of the subsurface. AMT results show that the north-south fault close to Bakreswar is a shallow feature, not deeper than m and thus cannot act as a heat source. The subsurface formation below the fault zone is highly resistive up to a great depth, indicating the absence of a heat source and geothermal reservoir in the vicinity of the BHS. AMT results indicate that the location of the geothermal reservoir is deep and lies beyond the profiles of measurement in the northwestern side of the Bakreswar Hot Spring. {\textcopyright} 2010 Society of Exploration Geophysicists.