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Operations in confined waters (both shallow and width‐restricted) are quite different from those in the open ocean, and in some ways are more dangerous. This paper acts as a guide to some of these differences, pointing out where the dangers lie, and provides some guidelines for designers and operators to consider. The paper covers the following topics: definition of confined waters; effect on resistance and powering; considerations for ship maneuvering; sinkage and trim effects; ship motions; and other effects. Most of the topics are dealt with in a qualitative manner, but some methods of predicting confined water resistance are presented.