The present invention provides a connecting device for connecting at least two floating bodies, in particular at least two stand-up paddle boards, side by side, comprising: a linkage having at least one rod; and a plurality of fastening means arranged on the at least one rod of the linkage, at least some of the plurality of fastening means being provided axially displaceable along the axis of the at least one rod of the linkage adapted to the respective geometry of the at least two floating bodies such that each floating body can be clamped between at least two fastening means on the at least one rod of the linkage in a positionally stable manner.