Interlocking construction block system

An interlocking construction block comprising:

• a top side;
• a bottom side opposite the top side;
• a front side having a front face defining an exterior surface of the front side;
• a back side opposite the front side, the back side having a back face defining an exterior surface of the back side;
• a right side having a right face defining an exterior surface of the right side;
• a left side opposite the right side, the left side having a left face defining an exterior surface of the left side;
• and
• a longitudinal axis that extends through the left and the right sides;
• wherein each of the front side, the back side, the right side, and the left side of the interlocking construction block extends vertically between the top side and the bottom side, the exterior surface of each of the front face, the back face, the left face, and the right face has a horizontally undulating outer surface defining a horizontal profile comprising a series of repeating features with straight vertical sides;
• wherein each of the front side, the back side, the right side, and the left side of the interlocking construction block has an upper outer profile and a lower outer profile, each of the upper outer profiles and lower outer profiles has features that define a vertically undulating shape extending horizontally, and the vertically undulating shape of the upper outer profile is complementary to the vertically undulating shape of the lower outer profile;
• and
• wherein the vertically undulating shape of each of the upper outer profiles and the lower outer profiles comprises vertical apexes and vertical troughs, the upper outer profiles comprise a single centrally-located first apex of the vertical apexes located at the longitudinal axis at the left side and a single centrally-located second apex of the vertical apexes located at the longitudinal axis at the right side, and the upper outer profiles at the left side and the right side slope downwardly from the first and second apexes until terminating at the front side and the back side to direct water to the front face and the back face.