Abstract: An open water swim belt consisting of a flag assembly having a flag attached to a flag pole, a base assembly that is positionable about a swimmer by attaching an adjustable belt, and a transition that extends perpendicular from the base. The transition is equipped with a receiver that is capable of receiving a flag pole. The swim belt is worn by a swimmer by positioning the base assembly against the lumbar section of the swimmer's back then securing the base in position by tightening the adjustable belt. A flag may be inserted into the transition of the base assembly and include identifiers, colors and a light to enhance the visibility of the swimmer. The swim belt provides comfort and safety by allowing a flag to provide visibility of the swimmers presence to boats and other surface water craft in the area of the swimmer.