Marcus Hewitt swings from a rope while jumping into a quarry lake in Cockeysville — just another not-real lake in Maryland. (Win McNamee/Getty Images)

Some days you will find pictures of clouds shaped like crabs. Other days, like today, you will find out that Maryland has no natural lakes.

I stumbled on the lake thread this morning — the link was titled “TIL Maryland has no natural lakes.” (Ahem: TIL is an acronym for Today I Learned.)

I thought, “Really?”

The post linked to a question-and-answer briefing on Maryland lakes from the Maryland Geological Survey.

“Yes, there are no natural lakes in Maryland,” the survey says. “All of Maryland’s lakes are man-made by damming rivers. Some have been named lakes (e.g., Lake Habeeb in Allegany County and Deep Creek Lake in Garrett County), but most have been named reservoirs (e.g., Loch Raven Reservoir in Baltimore County).”

And why don’t we have natural lakes?

The Survey says: “Some 74 percent of all lakes are glacial in origin, but glaciers never entered Maryland during the last Great Ice Age.”

But this was not always the case. Really. At one time, a long time ago, there was at least one (1) natural lake.

“We know of at least one, and there could be more,” the survey says. “The one clearly documented case is Buckel’s Bog, which was a 160-acre, shallow periglacial lake (actually a glade) that occupied the headwater region of the North Branch of the Casselman River in Garrett County during the late Pleistocene (19,000-14,000 years ago).”

I tried to find a picture of Buckel’s Bog but our archives don’t go back that far.