Jinhae is a district of Changwon . Changwon has about 1 million residents, and Jinhae itself has roughly 180,000 people. The city is located on the southern coast, facing the Korea Strait. Because of this geography, it became strategically important for naval defense. Jinhae has a deep, naturally sheltered harbor. The land curves inward, protecting ships from strong waves and outside attacks. The water is deep enough for large naval vessels to dock safely. Because it faces the Korea Strait, naval forces here could monitor and control major sea routes connecting Korea, Japan, and China. In earlier centuries, control of sea routes meant control of trade, communication, and military supply. For that reason, this region already had strategic importance during the Joseon Dynasty (1392–1910). In 1910, Korea was annexed by Japan. During the colonial period, Japan needed a strong naval base in the southern part of the peninsula. Jinhae’s protected harbor and strategic location made it ideal. ...