Abstract: An inflatable watercraft having an annular flotation member, a half-floor at the forward end for occupant seating, and a floor opening at the rearward end for passage of the occupant's legs therethrough. The half-floor is located at approximately water level when the craft is afloat, so that the person's legs extend through the opening at a relatively shallow downwardly angle for efficient propulsion of the watercraft. The half-floor is preferably made up of a series of transverse inflatable tube sections mounted in edge-to-edge relationship. A quick-detach oarlock mechanism is also provided, in which a trunnion block is detachably mounted to the top of the flotation tube by means of a retractable spring-loaded axle pin.