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High Density WSN deployments applicable to large scale area extent is a venture of vital importance for a number of critical infrastructures. National borders monitoring, prediction and prevention of natural disasters and even crisis management issues comprise the wide application filed. Because of the critical role of the application and for expense reasons as well, the efficiency of the network should be assured. Emphasis has been given to connectivity and redundancy concerns, as they constitute the main contributory factor to a fully operational network. Therefore, topology, with respect to simulation issues, includes all the aforementioned terms. In this paper, we analyze the extended grid of cells topology with overlaps and its enhancement, with the aim to reduce cost and increase the response time of a monitoring network, which mainly acts as an early warning system. The proposed topology meets the specific …