Yas is a private superyacht built by ADMShipyards of Abu Dhabi and launched in 2011. At 141 metres (463 ft) in length she is one of the largest motor yachts in the world.
Named Swift141 during development, Yas is based on the hull of a former navy frigate. The HNLMS Piet Hein, a Kortenaer-class frigate of the Royal Netherlands Navy was launched in 1978 and sold to the United Arab Emirates Navy where she was operated under the name Al Emirat. A second frigate of the same class is undergoing a similar conversion: the HNLMS Abraham Crijnssen, renamed Abu Dhabi and Swift135.