Offshore structure comprising - a platform, such as a vessel or a jack-up, having a deck with an X-direction corresponding to the centerline of the platform; - a cantilever mountable on the deck and movable with respect to the deck of the platform; - a skidding system that is arranged for supporting and moving the cantilever with respect to the deck, wherein the skidding system is arranged for translational movement of the cantilever along a longitudinal direction of the cantilever and for rotational movement of the cantilever around a vertical rotation axis; such that the cantilever is movable between a retracted position in which it substantially is above the deck, and an extended position in which it is substantially extended outside of the deck; - wherein the skidding system comprises - a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, and - a rotating system arranged to support and to allow rotation of the cantilever with respect to the deck around the vertical axis; - a supporting system arranged to support the cantilever on the deck characterized in that the supporting system is mounted at a distance from the rotating system along the X-direction; wherein the skidding system further comprises - supporting members arranged to engage the longitudinal cantilever rails with the rotating system; - supporting members arranged to engage the longitudinal cantilever rails with the supporting system; - wherein the supporting system comprises at least one deck rail arranged in a Y-direction substantially transverse to the X-direction; and wherein the rotating system comprises at least two deck rails mounted in symmetrical fashion with respect to the X-direction and having an angle (α) with respect to the Y-direction, wherein at least the deck rails of the rotating system are curved. - a platform, such as a vessel or a jack-up, having a deck with an X-direction corresponding to the centerline of the platform; - a cantilever mountable on the deck and movable with respect to the deck of the platform; - a skidding system that is arranged for supporting and moving the cantilever with respect to the deck, wherein the skidding system is arranged for translational movement of the cantilever along a longitudinal direction of the cantilever and for rotational movement of the cantilever around a vertical rotation axis; such that the cantilever is movable between a retracted position in which it substantially is above the deck, and an extended position in which it is substantially extended outside of the deck; - wherein the skidding system comprises - a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, and - a rotating system arranged to support and to allow rotation of the cantilever with respect to the deck around the vertical axis; - a supporting system arranged to support the cantilever on the deck characterized in that the supporting system is mounted at a distance from the rotating system along the X-direction; wherein the skidding system further comprises - supporting members arranged to engage the longitudinal cantilever rails with the rotating system; - supporting members arranged to engage the longitudinal cantilever rails with the supporting system; - a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, and - a rotating system arranged to support and to allow rotation of the cantilever with respect to the deck around the vertical axis; - a supporting system arranged to support the cantilever on the deck characterized in that the supporting system is mounted at a distance from the rotating system along the X-direction; wherein the skidding system further comprises - supporting members arranged to engage the longitudinal cantilever rails with the rotating system; - supporting members arranged to engage the longitudinal cantilever rails with the supporting system; - wherein the supporting system comprises at least one deck rail arranged in a Y-direction substantially transverse to the X-direction;