Having a boundary for a new settlement is one thing and is easily recognisable on surveyor's plan. But until the streets are formed, finding those boundaries is virtually impossible.
It was a conundrum facing early European settlers arriving in Whanganui in the 19th century and a problem echoed in other settlements being created across the country.
Athol Kirk's book, Streets of Wanganui, explains that when directors of the NZ Company were shown the first surveyors' plan of Petre (as the settlement was originally named), the only recognisable boundary was the Whanganui River to the east.
The first plan showed an area of landed bounded by Barrack St to the north, the Town Belt Rd (later Parsons St) on the west and Asylum St (eventually Purnell St) on the south side.
Kirk said Asylum Rd got that name because the land had been set aside for an asylum. It was never used for this purpose.