(ABC) - Landmark laws to protect two premium wine regions from urban sprawl have pleased many, but not all farmers in such things as dairy production. The character preservation legislation passed by the South Australian Parliament covers 40,000 hectares of farm land in the McLaren Vale region, south of Adelaide, and almost 150,000 hectares in the Barossa Valley, to the north-east of the city. It prohibits land in the zones from being subdivided for housing and removes the planning minister's power to approve major developments without parliamentary scrutiny.