It is correct and usable in written English.
It is used to indicate an approximate location or area, for example: "I heard there was a great restaurant somewhere about the city centre."
The larger sculptures and fountains weigh somewhere about 20 tons each".
But they all have to learn somewhere about right and wrong and integrity and passion and persistence.
"Where's Mrs. Pearson?" "Oh, somewhere about, I expect".
On average, a volcano erupts somewhere about once a week.
Somewhere about then, Donald Trump was giving an acceptance speech.
I read somewhere about putting Epsom salts around rosebushes.
Plus, he'd read somewhere about Clinton being in poor health.
"There must be a fighting streak somewhere about us Quakers," he liked to say.
If you took American history, it would probably exist somewhere about 1720.
He'd heard something, somewhere, about weak men redeemed by the society of good women.
The number of smaller crafts, unregistered, had increased even greater--totalling somewhere about 450,000.
