Also known as Na Drua, N'drua, Ndrua or Vaka Tepu (sacred canoe).
Druas are double-hull sailing boats. Technically, a drua is a pacific proa, they do not tack but rather shunt (stern becomes the bow and viceversa). Both ends of each hull are identical, but the hulls are of different sizes and the smaller one is always sailed to winward. The main differences compared to other pacific proas, are that the hulls have a symmetric U-form profile, and a second hull is used instead of an outrigger. When a float (ama) is used in place of the smaller hull, they are called Camakau (or Tamakau).
"The Fijian double canoe (wangga ndrua) was the largest and finest sea-going vessel ever designed and built by natives of Oceania before contact with europeans." 
Druas were large, up to 30 meters long, and could carry over 200 people. Despite being called "canoes" they were not dugouts, but plank-built ships.
No written record exists of the difussion of the proa design, but most anthropologists assume its origin in Micronesia, and it probably came to Fiji through the Kiribati and Tuvalu islands. The only Polynesian shunting type is the Pahi of the Tuamotu archipelago, but it uses equal hulls and does not appear related to other proas. From Fiji, druas spread to Tonga (where they are called Kalia) and Samoa (where they are called 'Alia). Captain Cook visited Tonga in his second and third voyages, and noticed that druas were rapidly displacing the Polynesian catamaran design. Tongan chiefs taking part in Fijian wars used to carry them back as bounty. Drua construction eventually became a monopoly of Tongan constructors living in the Fijian Lau Islands.
Druas were sacred canoes in the sense that only aristocrats could own one. Their main role was as war ships, taking part in naval battles and transporting warriors during raids. They also had a representative role, and were used to collect taxes. Following Fijian custom, it was an insult to cross her bows, or to sail to her winward, where the mast stay could be easily cut bringing down the sail. It was also custom to scull and not to sail in sight of another chief's territory. Launching a drua required a bloody ritual, including human sacrifices.
"With regard to the human sacrifice associated with the launching ceremonies, Wilkes (1985, vol. 3, p. 97) records that when Tanoa launched a canoe 10 or more men were slaughtered on the deck in order that it might be washed with human blood. Wall (1916) also says:
A new canoe was launched over men's bodies that mana might enter into it and make it swift and safe, but I can find no trace of living men ever having been used for this purpose; they were clubbed first. Certain small islands and districts enjoyed by hereditary right the doubtful honour of supplying the victims for these occasions, as for instance the island of Lauthala for the launching of the vessels of the Thakaundrove chiefs. "
The speed of druas became a legend for western sailors, who sometimes confused "fijian canoes" with "flying proas" (the later being the original Micronesian design). The low freeboard of the hulls outside the central platform predates the "wave-piercing" bows of modern racing designs. The one course that could not be sailed, was with the wind directly aft; otherwise her bows would be driven underwater. Her performance upwind is unclear, with some authors claiming it to be fast and close to the wind, and others describing it as making too much leeway with the wind in the quarter. The steering oars were massive, and big canoes would carry one at each end because they were too heavy to transport to the other side while shunting. The steerman (or men) risked being crippled or killed when hitting big waves. The chief used to stand on the platform's top, being responsible for cutting the sheet to avoid capsize.
"The disappearance of the double canoe of Fiji coincided with the close of the nineteen century. Few if any were constructed after 1883, the year of the death of King Thakombau, for his grandson, Ratu Popi, informed me that the king's sons two or three years later broke his double canoes to pieces and buried them in a swamp that they may be preserved and kept from being used by anyone else"
Only two original druas appear to have survived, both of them small. One, named Sema Makawa, is in the New Zealand National Maritime Museum. The second one is Ratu Finau, at the Fiji Museum in Suva.
Today, druas are still a symbol of Fiji, and Fiji's telephone booths are decorated with the characteristic mast-tops of druas.
- Haddon, A.C., and Hornell, J. (1936). Canoes of Oceania Volume I, The Canoes of Polynesia, Fiji, and Micronesia. Honolulu, Hawaii: Bishop Museum Press.
- Gravelle, K. (1979). Fiji's Times. A History of Fiji In Three Parts. Suva, Fiji: Fiji Times.
- Routledge, D. (1985). Matanitu. The struggle for power in early Fiji. Suva, Fiji: University of the South Pacific.
- Hocart, A. M. (1929). Lau Islands, Fiji. Bulletin 62. Honolulu, Hawaii: Bishop Museum Press.