The objective of this study is to review and reassess the Environmental Impact Assessment (EIA) of the Northern City in the Kingdom of Bahrain using the Rapid Impact Assessment Matrix Method (RIAM) on the potential environmental changes of the project on the marine environment, as well as following up its implementation. The review of the EIA of the Northern City project helps in illustrating its potential environmental impacts, enhancing the related government agencies' points of view, and alleviating the opposition of the stakeholders, such as local residents, fishermen, and environmental NGOs, to the project and the establishment of similar ones. RIAM was constructed through surveying the opinions of a number of experts and stakeholders, and the matrix obtained results were compared with the EIA of the Northern City prepared by the consulting company. The matrix was designed to include 34 elements grouped into four factors: 1) Biological-Ecological; 2) Physical-Chemical; 3) Social-Cultural; and 4) Economical-Operational. These factors would be affected, directly or indirectly, by the project during its different phases of implementation. Analysis of the RIAM results identified a group of environmental elements that would be negatively affected, and would require further study and investigation to avoid their possible cumulative impacts on public health, which are water quality, trace elements, and elements pertinent to fishery resources including fish traps, coastal and marine organisms, and solid waste. The study indicated that the depth of investigation in the EIA report prepared by the consulting company does not meet some of the basic requirements of such reports, where the cumulative impacts associated with the project could have future implications on the environment. [ABSTRACT FROM AUTHOR]