Ecotourism is a type of tourism that supports conservation and gives appreciation to the environment, social culture and community participation. The management of the ecotourism area on Reusam Island is very much needed to find out the potential and constraints obtained by visitors in the sustainable development of the ecotourism area. This research was conducted in August 2018 until July 2019, carried out by direct observation to collect primary data following expert provisions. Conformity analysis is done to get the suitability of field conditions with the ideal conditions of experts. Based on the topography, Reusam Island is included in the very small island category, an area of about 22 hectares, which is divided into 4 regions. Reusam Island resources are based on water geomorphological parameters, diversity, marine oceanography physics, water quality, and supporting factors following the indicators of the suitability of experts to become ecotourism areas.