Connection arrangement for panels

A connection arrangement for panels, comprising a first panel having a first main plane, and a second panel having a second main plane, wherein the first main plane is essentially perpendicular to the second main plane in a connected state, wherein the second panel comprises a groove on a first face adapted to cooperate with a first protruding edge which is formed in one piece with the first panel, wherein the first protruding edge comprises a longitudinal insertion recess at a side of the first protruding edge, wherein a flexible locking element is arranged in the longitudinal insertion recess, wherein a side of the groove comprises a longitudinal recess which is configured to cooperate with the flexible locking element in the connected state, wherein the groove comprises, in a longitudinal extent along the first face, at least a first groove section, an intermediate groove section, and an adjacent groove section, wherein the intermediate groove section is longitudinally between the first groove section and the adjacent groove section, wherein a panel thickness of the intermediate groove section is greater than a panel thickness of the first groove section and a panel thickness of the adjacent groove section, wherein the first protruding edge comprises at least a first protruding section and an adjacent protruding section, and wherein the first groove section is configured to cooperate with the first protruding section and the adjacent groove section is configured to cooperate with the adjacent protruding section in the connected state, wherein the first protruding edge has an end facing a first direction and the first and adjacent protruding sections extend outward at the end of the first protruding edge in the first direction.