A 21ft long jet boat is a fast and agile vessel designed for recreational use on lakes, rivers, and other bodies of water. Jet boats are typically powered by a jet propulsion system, which uses a water jet to propel the boat forward, making them highly maneuverable and ideal for activities such as water skiing and wakeboarding. The 21ft length offers ample space for a small group of passengers, while still being easy to handle and transport. Jet boats are often designed with a sleek and sporty look, and may include features such as a sunpad, swim platform, and stereo system for added comfort and entertainment.