During siege, they enabled Athens to access its fleet to send it out to harass the home cities of its attackers. It also provided a means of bringing in food supplies.
Bring supplies to Athens
The human-made system of defense, defense walls, also known as long walls, connected the city of Athens to port of Piraeus. Salvatore Salsa
Athens was on the coast, so was open to surprise seaborne attack. Sparta was inland and could have warning of and prepare for a land attack. However there were other factors: Athens was walled, could therefore be defended by a small force, and being connected by walls to its seaport, could import food when under siege. It could also send out an expedition by sea to attack it's attacker's home city while that city's army was besieging Athens.. Sparta was unwalled and had to be defended by land battle in the open, so it depended on the army being home and strong enough to see off an attacker. Sparta also had a large serf population nearby and was vulnerable to an uprising.
The acropolis is the walls of Athens. To answer your question, it is surrounds Athens.
To secure Athens from Piraeus
Very Wide
The Long Walls - these walls allowed the defenders during a siege to get access to the port, allowing them to import food, and send out naval forces to attack the home cities of besiegers during their absence.
In 490 BCE in the Plain of Marathon and the same day before the walls of Athens.
The long walls of Athens protected Athens and its physical harbour of Piraeus. The distance was 24 kms. Remnants of the wall may be noticed in specific areas even today.
A rocky coastline and mountainous interior with a couple of arable plains with poor quality soil good enough for barley, but not wheat. A central plateau on which was fortified as a refuge in emergency. A good sheltered port connected by walls to the city walls, which enabled permanent protected access between them for trade, fishing and naval purposes.
Sparta had no walls, relying on it's warriors as its walls.
The two great ramparts that protected the roadway from Athens to the sea were known as the Long Walls. They were fortifications that protected the city from invaders.
No, but it had one of the largest armies and war fleets of the Greek city-states which, combined with its city walls and fortified port connected to the city, gave it strong offensive power ability to resist siege while striking enemy home cities by amphibious attack.