An apparatus for floatation of one or more persons on water includes a floatation device. The floatation device is sized for a single person and can be interlocked (i.e., secured) to additional floatation devices. Each individual floatation device is preferably made from an air-filled vinyl mattress or from foam. Each floatation device preferably includes at least one protrusion and at least one recess; however any desired combination of protrusions and recesses may be included. The protrusion of one individual floatation device interlocks within a recess of a second individual floatation device. A pair of retaining clips helps maintain each of the protrusions within the recesses. Any desired number of the individual floatation devices may be secured together to provide a larger overall floatation device for use by multiple persons while still providing each person their own personal floatation device.