Today , the system as a whole services areas as far west as Blacktown .
Today , the bounded to the north by Narrabeen Lagoon , St Ives and Hornsby and to the south by Sydney Harbour , Lidcombe , Yagoona and Guildford .
Today , the system as a whole services areas as far west as Blacktown and bounded to the north by Narrabeen Lagoon , St Ives and Hornsby and to the south by Sydney Harbour , Lidcombe , Yagoona and Guildford .