the long range batteries of and guns included ten batteries with six 10 inch batteries and four 6 inch batteries, with one more under construction. the basic shape of the batteries is four guns in a row protected from the front by a concrete parapet of approximately thick with traversal walls between the gun positions. the batteries had no rear protection. shelter for crew and ammunition cellars were built into and under the front parapet and the traversal walls. while the basic plan is similar, each battery is unique depending on the terrain. for the 10 inch guns the average distance between guns is , but on smaller island such as katajaluoto the guns are only apart while the larger isosaari battery (no 1) has guns apart. similarly the 6 inch batteries have guns apart on average, but in the very cramped harmaja battery the distance between guns is only and the battery is not built on straight line but in a crooked l-shape. many batteries have an icon closet framed with granite.