geostone segmental retaining wall systems offers a new type of retaining wall and seawall with our landscape retaining wall system. ease of installation and esthetic beauty make this the best segmental retaining wall system / block on the market. csi 02832 segmental retaining walls. these types of walls are commonly referred to as retaining walls or more specifically segmental retaining walls, modular wall systems, mse walls or mechanically stabilized earth walls which usually fall under the csi codes of 02830 & 02832.