The long-tail boat, (Thai: เรือหางยาว, RTGS: ruea hang yao, pronounced [rɯ̄a̯ hǎːŋ jāːw]) is a type of watercraft native to Southeast Asia, which uses a common automotive engine as a readily available and maintainable powerplant. A craft designed to carry passengers on a river may include a lightweight long canoe hull, up to 30 metres, and a canopy. There is much variation among these boats, some have evolved from traditional craft types, while others have a more improvised look—the sole defining characteristic is a second-hand car or truck engine.
Long-tail boats are now often used to transport tourists. There are also competitions involving long-tail boats in some provinces of Thailand.
