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This study provides a mechanism to divide the complete geographical extent of wireless sensor networks (WSNs) under attack of a jammer into different zones as per the severity of jamming experienced by various nodes of the network. There are some existing methods such as, `Localised Edge Detection in Sensor Field`, `Robust Edge Detection in Wireless Sensor Networks` and `JAM: A Jammed Area Mapping Service for Sensor Networks`, that solve similar problems; but all of them are able to map the geographical extent into only two zones ` `jammed` and `not jammed`, and they all are vulnerable to information warfare as they all require to communicate even while under a jamming attack. The proposed method for zonalisation of the geographical extent of WSNs based on the effects of jamming on various nodes follows the centralised approach, where the mapping is done by the base station through hull tracing of jammed nodes as per their pre-calculated jamming indices thus enforcing the economy of scale, and making it one of the most energy-efficient and fastest-known mapping systems. The method is procedure-centric, as against almost all of the known systems that are protocol-centric, wherein the proposed method dispenses with the need of inter-nodal communications during moments of jamming. The system has no inherent inaccuracies.