What's this?

Probably hard to see what this is, could be some macroshot, could be anything. It's in fact a nearby lake with some trees and a road on the other side that are reflected perfectly in the water. You're actually seeing over a mile of water here, during a 30s exposure.

Seems that the resizing algorithm on blipfoto has some problems with the clouds and the reflection on the water though, looks like a lot of JPEG artefacts that aren't there locally.