Contryside campaigners have called for more land south of Arundel to be included in the South Downs national park.
Members of the South Downs Campaign backed proposed boundary changes but said the planned park should be extended further south where it passes the historic town.
The Countryside Agency is consulting on the changes following Transport Secretary Alistair Darling's decision last year to axe the planned Arundel bypass.
Campaign chairman Robin Crane said: "We fully support the inclusion of more land in the national park, which is important to the setting of Arundel.
"However, we are also objecting to the new boundary because it excludes the water meadows further south."
Consultation runs until March 1. The boundary changes will be considered at the public inquiry into the park plan, due to continue until September.
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