Monitoring the desired Region of Interest (RoI) is one amongst the most services provided by wireless sensor network. In RoI, the emergence of holes is inevitable because of random preparation and environmental factors. Due to these factors the nodes in the network get affected and hence the holes are formed. In this paper, various types of holes their characteristic and major cause for the holes formation are discussed. Also Distributed Hole Detection (DHD) algorithm is proposed for the detection and identification of holes.