Meaning of the word "fold" in the sentence "Lamb astray from the fold" [closed]

Here's a extract from the fable "wolf and the lamb" from Aesop's Fables by George Townsend

Wolf, meeting with a lamb astray from the fold...

In the above sentence what is meant by "fold"? Is it a flock of sheep?

Some will regard this question as reflecting "lack of research", but I consulted the common on-line dictionaries and a couple lacked the proper definition entirely, while others buried it at the bottom of the entry.

But here's a (rather well-concealed) definition from Cambridge Dictionary which fits pretty well:

A fold is a fenced area on a farm where sheep are kept during the night.