We're not sure if America's notoriously bad sense of geography is to blame - or someone from Norwich working their last day in the CNN graphics department.

Whatever the cause: CNN unfortunately made a hilarious on-screen gaffe at the weekend - by putting London on the map where Norwich should be. And now their mistake has gone viral.

As is always the case with such things, it's hard to know where it started - though it appears that the first viewer to photograph the offending screenshot was Facebook user Nikki Godden. It then got picked up by @yaellevy (among others) on Twitter, and as a result by Evening Standard reporter @lucytobin - and the rest is viral history.

CNN International has apologised for the blunder, tweeting today from its @cnni account: "CNN apologises for a map error which shifted London from its correct location! We have corrected this & are looking into how this occurred."

Oh well, it could have been worse. They could have pinpointed Cornwall as a city. Oh. Wait...