as passenger ferries in the Pasig River of the Philippines. Catamarans and single-outrigger canoes are the traditional configurations in Polynesia, Micronesia, and Madagascar. In the Pacific Islands, a single outrigger float is called an ama. It is connected to the main hull by spars called iako (Hawaiian), iato (Tahitian), or kiato (Māori). The ama, which is usually rigged on the left side, provides stability. The paddlers need to be careful to avoid leaning too far on the opposite side of the ama, as that may cause the canoe to capsize (huli or lumai). Double-outrigger configurations, a later innovation from Southeast Asian Austronesians, never reached Oceania. Single-outrigger dugout canoes also survived until recent times in some parts of the Philippines. Examples include a specimen in the University of Southampton from Manila Bay collected in the 1940s, as well as boats from Lake Bulusan and Lake Buhi of the Bicol Region of southern Luzon from as recently as 2015. The single outrigger is used to provide lateral stability, while still allowing fishermen to work with fishing nets. These boats were paddled and were not equipped with sails. They have largely disappeared in modern times, partly due to the scarcity of suitable timber and partly due to the relative cheapness of fiberglass boats. List of traditional outrigger vessels by region The following is an incomplete list of traditional Austronesian outrigger vessels. It also includes catamarans. Island Southeast Asia Indonesia Borobudur ship Jellore Jukung Knabat bogolu Kora kora Londe Paduwang Pangajava Pangkur Pelang Perahu Sandeq Malaysia Penjajap Pelang Perahu Philippines Armadahan Balación Balangay (Baloto, Biray, Biroko) Bangka (Sakayan) Bangka anak-anak Basnigan Bigiw Casco Djenging (Balutu, Kubu) Guilalo Junkun Karakoa Lanong Pangayaw Paraw Salisipan Tataya Vinta (Dapang, Pilang) Island Melanesia Fiji Camakau Drua (Wangga tabu) Takia Papua New Guinea Lakatoi Solomon Islands Tepukei Vanuatu Aka Angga Wangga Tonga Hamatafua Kalia Pōpao Tongiaki Micronesia Caroline Islands Wahr Kiribati Baurua Marshall Islands Tipnol Walap Mariana Islands, incl. Guam Ladjak Sakman (Flying proa) Palau Kaep Wa Yap Chugpin Popow Wa Polynesia Cook Islands Vaka Vaka katea Hawaii Malia Wa'a Wa'a kaulua Marquesas Vaka touua New Zealand Waka ama Waka hourua Samoa Alia Amatasi Laau Lualua (Foulua) Paopao Vaa Vaa-alo Vaa-tele Society Islands Ivahah Pahi Tipairua Vaa Tuvalu Paopao Madagascar Lakana Non-Austronesian outrigger boats The following are traditional outrigger boats acquired by other cultures from contact with Austronesian sailors. Sri Lanka Oruwa East Africa Ngalawa Laana Modern sport Outrigger