For some odd reason, Trip Advisor (TA) treats Belem like a different city, like the adress of the Tower of Belem.
There's no such thing as Belem city.
In Portugal, the main political division of the territory is Municipalities and their subdivision of civil parishes.
Belem is the west-southernmost civil parish of the city of Lisbon (city of Lisbon = Lisbon Municipality).
The city of Lisbon or the Lisbon Municipality is administratively organized by 24 civil parishes. Belem is just only one of them. Here's a map of the recent reform of the city of Lisbon with the civil parishes (they used to be 53, by the way): …ecivitas.net/conteudos/…20Cidade.jpg
The civil parish is basically the combination of several neighbourhoods or only a neighbourhood, depends on their size. Each one have some political powers, they have their own Assembly where they debate the neighbourhoods problems.
Maybe TA is confusing the district of Lisbon with the Municipality of Lisbon.
The district of Lisbon is Portugal's regional section of several municipalities, like Oeiras, Amadora, Cascais and so on. Here's a map of Lisbon's district Municipalities: cases.pt/0_content/…lisboa.gif
The Municipalities are political and administrative independent from one another. All of them have their own Mayor. The Mayor of Lisbon runs the city of Lisbon (above all civil parishes' reduced powers), not the district of Lisbon.
Nobody runs political the district. They're more like historical, almost obsolete, geographical regions.
The region of Belem is part of the city of Lisbon since late XIX century, for your information.
I think tourists are being completly deluded.Edited: 9:50 am, September 15, 2013