To underline the strength of junior swimming in Northland, the boys' and girls' 12-and-under 200m medley relay teams are both ranked fifth.
The boys' relay team consists of Henare Cherrington, Taihorangi Morgan-Edmonds, Elliott and Gaualofa.
The girls' relay team is made up of Nalani Karena-Waenga, Matariki Moetara, Bailey and Aarai Makaore.
Other swimmers to travel to Wellington for the championships include Bay of Islands' Ruby Murray, Ben Gaualofa and Emilia Finer, Bream Bay's Conor Swords and Jordan Carswell, Whangarei's Kennedy Boswell-Smith and Katelin Milina, Kaitaia's Nina Rose, Northwave's Caitlin Ahlers, and Doubtless Bay swimmer Farry Channell-Wilson.
In previous years the event was held simultaneously in two locations, with the results merged to find the medallists.
This year, all competitors will race against each other at the championships.
The championships consist of four sessions, starting this afternoon and concluding on Sunday.