What is the mysterious black ring in this spectacular photo of London at night?

Question

In this supposed night photograph of London from space:

there is a black ring just north of The O2 — see the circle in the top-right quadrant below?

I can't find it on Google Maps.

Is it a real feature, something on the lens or window, or evidence that the photo is fake?

Answer 1

It is just an illusion nothing more.

Map from Bing maps

Answer 2

Here's another source for what appears to be the same photograph downloadable at higher resolution.

I think it's the parking lot (and row of trees next to it) encircling a bus garage. Here is a link to Google Earth (via Google Maps) zoomed in on it. The image is rotated relative to Google's map (north is not "straight up"), and, as someone else pointed out, the city is not seen from straight above but from an angle.

Wikimedia has a different one from the other direction which might lead to further insight (or intrigue).