Nappy Valley is a colloquial epithet applied to pleasant places with high (demographic) reproduction.
It also linguistically tied to Napa Valley a successful wine region of California.
The street is labelled 'Nappy Valley' by Will Self in his February 2010 London Review of Books Diary entry.
The district occupies 117 square kilometres (45 sq mi) to the east of the Murrumbidgee River.
The new town centre, composed largely of young families, soon became known locally as "nappy valley".