The term 'MUCH OF THE SILK ROAD IS IN IT' is referring to the continent of ASIA, which has four letters. The Silk Road was an ancient network of trade routes that connected the East and West, stretching from China to the Mediterranean Sea. It was used for centuries to transport goods such as silk, spices, and other commodities. Much of the Silk Road is located in ASIA, making it an important part of the region's history and culture.