"We were delighted to see a book that both engaged and respected older readers, with material as subtle as it is honest and provocative," Mr Beckett said.
It was great to see new talent emerging to line up alongside more established authors and illustrators, he said.
As the winner of both the Young Adult Fiction category and the New Zealand Post Margaret Mahy Book of the Year award, Mr Dawe received $15,000 in cash prizes.
• Best Young Adult Fiction and New Zealand Post Margaret Mahy Book of the Year: Ted Dawe, Into the River (Mangakino University Press);
• Best Non-Fiction: Simon Morton & Riria Hotere, 100 Amazing Tales from Aotearoa (Te Papa Press);
• Best Junior Fiction: David Hill, My Brother's War (Penguin Group NZ);
• Honour award, Junior Fiction: Barbara Else, The Queen and the Nobody Boy: A Tale of Fontania series (Gecko Press);
• Best Picture Book: Margaret Mahy & Gavin Bishop, Mister Whistler (Gecko Press);
• Best First Book: Hugh Brown, Reach (HarperCollins); and
• Children's Choice: Kyle Mewburn, Ali Teo and John O'Reilly, Melu (Scholastic NZ)