Magnum, P.I. is a popular American television series set in the fictional town of Honolulu, Hawaii. The show follows the adventures of Thomas Magnum, a private investigator who lives on the island of Oahu. Oahu is the third largest and most populated of the Hawaiian Islands, located in the central Pacific Ocean. It is home to the state capital of Honolulu, as well as many other cities and towns. Oahu is known for its beautiful beaches, lush rainforests, and vibrant culture.