across what's known as

[güey]

I believe that there is a syntax error in this sentence, namely, it should have been "that/which is known as..." with the repetition of "across" omitted. Would you please confirm is I am correct?

This reality has pushed the NATO frontlines significantly further to the East across the wider section of the North European Plain [corrected] and a separated Russian territory between the mainland and the Kaliningrad exclave here, across what's known as the Suvalky Gap.

 

[Tarheel]

I don't see the problem. However, it should be "the North European Plain". (That video goes on forever.)

 

[emsr2d2]

"across what's known as" is grammatically correct and natural. It's a common construction - "what's known as" is the relevant part. It can be preceded by many other words.

He played a major role in what's known as the most daring heist in history.
She developed her skills through what's known as The Magic Bullet method.
They both have what's known as a kiss curl.

 

[teechar]

There is no error. The reason for repeating "across" is that the sentence is long and the speaker wants to refocus the listener's attention back on the point he's making.
Also note that he says "the wider section of the North European Plain" + "a separated Russian territory between the mainland and the Kaliningrad exclave" = "the Suvalky Gap".
However, your change could imply: "the Kaliningrad exclave" = "the Suvalky Gap"