I'm not a lawyer, but I believe zones like this are technically considered the high seas, so if you cut a pizza into a spiral there you could be charged with pieracy under marinaritime law.

"River Border", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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I'm not a lawyer, but I believe zones like this are technically considered the high seas, so if you cut a pizza into a spiral there you could be charged with pieracy under marinaritime law.