Weird Lake

[Bogie]

I was just playing around with Google maps and I stumbled across this lake in eastern Canada, and thought it looked rather weird.
I'm not a geologist so I am not sure what the heck is going on here. Trying to guess how this formed my first thought was volcanic crater filled with water and central island pushed up by magma pressure. But usually the island in a volcanic lake is much smaller than the lake, this looks more like a circular river. The overall size isn't typical. The ring lake is 35 miles across and the island is about 25 miles diam. So if this is volcanic it is not a normal size volcano, it would have to be a Super Caldera.

Any one more knowledgeable care to comment?

[jbgibson]

One heckuva impact crater, encouraged to be a lake+island by a dam.

[justkae]

I just posted this lake!!!

Rene-Levasseur is the second largest lake-island (edit) in Canada (/edit)formed with a few years ago they dammed it up. It was a meteorite impact crater.

I've taken a street map snap and have a wIP in my photoshop. So excited to create something

[justkae]

From http://maps-for-free.com

[Bogie]

Thanks for the information Justkae & JGibson. It is such an odd looking island/lake formation, very interesting.

[johnvanvliet]

that impact crater is just a bit north of me

and a VERY well known old impact remnant

now for something rather ODD -- there is this
https://photos.app.goo.gl/acAOdtAumQdOIFOG3
( a crop of the strm2.1 data )

a small album of other images , including that one
https://goo.gl/photos/QvpzL85r5SsdcKwd7

also on one of the images in that album IS that crater

[justkae]

@johnvanvliet

one of them is south Africa! I live there. Our escarpment is the bet escarpment