South Korea's Coastline Grew by 307km in 12 Years Due to Development Projects

South Korea's coastline has expanded by roughly 307 kilometers over the last 12 years, primarily driven by coastal development and maintenance projects like port construction and breakwater installation. The National Maritime Research Institute's "2nd Coastal Change Survey" revealed that the total coastline length reached 15,270.4 kilometers in 2026, a 2.1% increase from 14,962.8 kilometers recorded in 2014.

The survey defines coastline as the boundary between land and sea at high tide. It categorizes coastlines into natural and artificial types. Artificial coastlines, those adjacent to structures like roads and breakwaters, saw a significant increase of 12.2%, growing by 619.5 kilometers from 5,085.7 kilometers in 2014 to 5,705.2 kilometers in 2026. Conversely, natural coastlines, areas without man-made structures, experienced a decrease of 3.2%, shrinking by 311.9 kilometers from 9,877.1 kilometers in 2014 to 9,565.2 kilometers in 2026.

This shift highlights the impact of human intervention on the nation's coastal geography. The expansion of artificial coastlines reflects ongoing efforts in infrastructure development and coastal management. While the exact reasons for the specific increase in Shinan county's coastline were not detailed, the overall trend indicates a significant transformation of South Korea's coastal landscape over the past decade.