Facility cultivation refers to all cultivation methods that artificially control the environment for ideal crop growth. Although not common until the 1970s, such cultivated lands rapidly increased from an area of 4,971 ha (0.23%) in 1997 to 90,468 ha (5.39%) in 2015 as they guaranteed higher productivity than raising crops outdoors. Natural and economic conditions must be considered when installing a glass or PVC greenhouse. Since sunlight and temperature conditions directly influence crop growth, a flatland environment with long hours of sunlight, sufficient insulation, and a low heating load is favorable, especially during the winter. Also, areas that have easy access to irrigation water and fertile soil with good drainage are ideal. Facility cultivation requires convenient traffic conditions or close proximity to warehouses, markets, airports, or container ports, and also needs an abundance of labor. The Nakdonggang midstream and estuary areas satisfy such conditions and have consequently experienced rapid changes in cropland use as a result of facility cultivation.