INFORMATION:

Situated on a spit of land in Poole harbour.
Drive through Wareham (coming from the north, off the by-pass) continue through the town centre, across the traffic lights, cross the river bridge and causeway. At the end of the causeway turn first left at Stobough and follow the narrow road to Arne. There is a an RSPB car park (£4.00) or park safely before it.

OS Ref: ST971878
You can use the Ordnance Survey 'Get a Map' and follow the instructions. Copy and paste the map reference.