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In wireless sensor networks (WSN), the energy hole problem is the major factor which shorten the network lifetime. While transmitting the data, a sensor node dissipates energy. The energy consumption rate of sensor nodes differs with the different transmission range distance. A sensor node with the same transmission range dissipates more energy to forward the data for the short distance and it results in higher energy dissipation. In this paper, in order to find the best transmission range which utilize the energy of the nodes efficiently and prolongs the network lifetime, an Optimal Transmission Range (OTR) algorithm is proposed. While transmission, a node transmits the data to all the nodes within its transmission range which results in unwanted energy consumption. In order to save energy of the nodes, a region is constrained and the data are transmitted to the nodes within the region. The random selection of nodes to forward data will result in energy imbalance. To balance the energy consumption, a maximum residual energy node is selected in the region to transmit the data. Simulation results show that the region constraint strategy with the OTR outperforms same transmission range.