The '''Athens Urban Area''' (), also known as '''Urban Area of the Capital''' () or '''Greater Athens''' (), today consists of 40 municipalities, 35 of which make up what was referred to as the former Athens Prefecture municipalities, located within 4 regional units (North Athens, West Athens, Central Athens, South Athens); and a further 5 municipalities, which make up the former Piraeus Prefecture municipalities, located within the regional unit of Piraeus as mentioned above. The densely built up urban area of the Greek capital sprawls across  throughout the Attica Basin and has a total population of 3,074,160 (in 2011).