Ezekiel 30:15

And I will pour my fury upon Sin, the strength of Egypt; and I will cut off the multitude of No.

I will pour my fury upon Sin - i:e., Pelusium, the frontier fortress on the northeast; therefore called "The strength (i:e., the key) of Egypt." It stands in antithesis to No or Thebes, at the opposite end of Egypt - i:e., I will afflict Egypt from one end to the other.