A floating marine dock and connection system there for provides plural elongate rectilinear flotation pontoons having a consistent peripheral configuration with a major dimension and a minor dimension and customizable lengths. Connection apparatus interconnected to the flotation pontoons permits the flotation pontoons to be interconnected end-to-end, in parallel, perpendicular to, and spaced apart from one another. Connection straps extend about the outer periphery of the flotation pontoons and interconnect with flanges, plates and accessories desirable for marine docks. The connection straps support a nailer beam to which decking is fastened. Braces extend between spacedly adjacent flotation pontoons to maintain the spatial relationship therebetween and to support service conduits.