The following notes are the outcome of a visit paid to Vavau, Haapai and Tongatabu in 1925 for the express purpose of studying the structure of the surviving sea-craft of indigenous origin in the Tongan Islands. At the present day these comprise numerous dugouts called bopao and tuingutu and a very few plank-built sea-going canoes, tafa-‘anga, used in the bonito-fishery. All are provided with single outriggers, characterized by indirect attachment.