As international demand for seaweed rises, images like this one showing part of South Korea have become common. According to one estimate, the country now produces up to 1.7 million tons of seaweed each year. With its warm temperatures and modest tides, Wando County’s shallow waters offer an ideal environment for raising kelp, laver, and sea mustard. Seaweed has long been prized in South Korea. South Korea is the world’s top exporter of Pyropia, a type of red seaweed often used to make nori for sushi.