The Rectangular Survey System, also known as the Public Land Survey System (PLSS), is a method for subdividing and describing land in the United States, established in the late 18th century. This system divides land into a grid of rectangular parcels using a series of principal meridians and base lines, enabling efficient land distribution, management, and settlement. It has played a crucial role in shaping the cultural landscape of the U.S. by influencing land use patterns and urban development.