Wall block made of artificial stone material, having the following features: An overall elongate form with a longitudinal central axis and with a length that is greater than the width (b) of the wall block; a first seating face with a first seating surface and an opposing second seating face with a second seating surface; a first end face and an opposing second end face; a first wall surface side and an opposing second wall surface side; a lateral surface which extends on its first end face, its first wall surface side, its second end face and its second wall surface side; at the transition between its first end face and its first wall surface side and/or at the transition between its first end face and its second wall surface side, a fin which protrudes beyond a virtual flat surface located at the center of the first end face at a right angle to the longitudinal axis of the wall block; a plurality of extension arrangements, arranged in a row on its first seating face, and a plurality of receiving arrangements, arranged in a row on its second seating face, wherein a respective extension arrangement and a respective receiving arrangement are preferably arranged with a common central axis, and wherein the extension arrangements and the receiving arrangements are each complementary to one another such that, when two wall blocks are adjacent each other with the first seating face against the second face, a particular extension arrangement of the one wall block fits in form-fitting engagement with a particular receiving arrangement of the other wall block, irrespective of whether the two wall blocks are rotatably angled relative to each other or not, characterized in that the wall block comprises a peripheral wall, whose outer side forms said lateral surface of the wall block, wherein the wall block has a single free passage or a plurality of free passages, passing from its first seating face to its second seating face and being surrounded by the peripheral wall. An overall elongate form with a longitudinal central axis and with a length that is greater than the width (b) of the wall block; a first seating face with a first seating surface and an opposing second seating face with a second seating surface; a first end face and an opposing second end face; a first wall surface side and an opposing second wall surface side; a lateral surface which extends on its first end face, its first wall surface side, its second end face and its second wall surface side; at the transition between its first end face and its first wall surface side and/or at the transition between its first end face and its second wall surface side, a fin which protrudes beyond a virtual flat surface located at the center of the first end face at a right angle to the longitudinal axis of the wall block; a plurality of extension arrangements, arranged in a row on its first seating face, and a plurality of receiving arrangements, arranged in a row on its second seating face, wherein a respective extension arrangement and a respective receiving arrangement are preferably arranged with a common central axis, and wherein the extension arrangements and the receiving arrangements are each complementary to one another such that, when two wall blocks are adjacent each other with the first seating face against the second face, a particular extension arrangement of the one wall block fits in form-fitting engagement with a particular receiving arrangement of the other wall block, irrespective of whether the two wall blocks are rotatably angled relative to each other or not, characterized in that the wall block comprises a peripheral wall, whose outer side forms said lateral surface of the wall block, wherein the wall block has a single free passage or a plurality of free passages, passing from its first seating face to its second seating face and being surrounded by the peripheral wall.