The term "third island chain" refers to a geographical area comprised of a group of islands in the Pacific Ocean. This region is of strategic importance to countries such as China and the United States due to its location along major shipping routes and naval bases. Synonyms for this term include "outer islands," "Pacific islands," and "remote islands." Other descriptors that may be used to refer to this area include "far-flung islands," "isolated islands," and "offshore islands." The third island chain is also sometimes referred to as the "interior Pacific islands," as opposed to the first and second island chains, which are closer to mainland Asia.