Checkout these amazing satellite images from NASA’s Goddard Space Flight Center. They were taken in January 2014 and show rows of seaweed that lie underneath the shallow waters surrounding Sisan Island, South Korea. These neatly arrange rows on the seafloor are actually part of a seaweed farm. NASA Earth Observatory explains:
"Since 1970, farmed seaweed production has increased by approximately 8 percent per year. Today, about 90 percent of all the seaweed that humans consume globally is farmed. That may be good for the environment. In comparison to other types of food production, seaweed farming has a light environmental footprint because it does not require fresh water or fertilizer."
More amazing photographs can be found here on Flickr.