Rome tourists baffled after city installs wrong street map.

Tourists arriving into Rome's central Piazza Venezia have been left scratching their heads thanks to a new information panel, with detailed street map, installed by the city in recent days.

The only problem is that the "you are here" style map relates to Porta Maggiore - located about three kilometres away - not Piazza Venezia in the city centre.

The display panel, which carries the municipal SPQR crest alonsidde "Porta Maggiore" in bold letters, was erected in the Piazza di S. Marco side of Piazza Venezia, near the terminus of the number 8 tram.

The error came to light after an image of the mistaken map was posted on social media by Roman politician Giorgio Carra of the Partito Democratico.

The city has received multiple requests to remove the map, which was installed as Rome battled a heatwave.

In the meantime it is not clear where the Piazza Venezia map ended up. Porta Maggiore perhaps?