Abstract WSNs are infrastructure-less networks that are why these networks can be easily deployed in any disaster situations like floods, battlefields, etc. They are easy, fast, and cost-effective to deploy for some limited period [3]. Due to the limited energy and open nature of WSNs the energy and security of the network become the major challenge. The network energy can be saved with the help of efficient routing which will enhance the network lifetime. In this paper various routing protocols like LEACH (Low Energy Adaptive Clustering Hierarchy), PEGASIS (Power-Efficient Gathering in Sensor Information Systems), etc. LEACH routing protocols are reviewed that are designed based on clustering architecture where the network is divided into various clusters also known as zones based on their energy.