Once, large operators, known as "factors," controlled huge tracts of forests, some in the hundreds of thousands of acres, which they leased to "operators," and also advanced them capital, usually in the form of tools and other equipment and goods with which to operate. The operators satisfied their debt to the factors by returning the produce, barrels of resin. The name "Factors Walk" on the riverfront in Savannah, Georgia, commemorates an area on the Savannah River harbor where thousands of barrels of produce were collected for transshipment. Between 1880 and 1920, Savannah was the largest port for naval stores products and continued to set the world price of naval stores until 1950.