The public inquiry called to decide whether the South Downs should be designated a national park will take place at Worthing.
The Planning Inspectorate said it expected most of the inquiry to be held in the town, although some sessions could take place elsewhere in Sussex and Hampshire.
A venue for the mammoth hearing, due to start in November and expected to last 12 to 18 months, has not yet been agreed.
Rural Affairs Minister Alun Michael ordered the hearing following objections from councils.
National park campaigners accused the authorities of triggering a long and costly inquiry.
A pre-inquiry meeting will take place at the Pavilion Theatre, Worthing, on July 7 starting at 2pm.
The inquiry website is on: www.planning-inspectorate.gov.uk/southdowns
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