To what did God say, "You may come this far, but no farther"?

Answer: The sea

God enclosed the sea behind doors and told it, "You may come this far, but no farther; here your proud waves must stop."

“Who enclosed the sea behind doors when it burst forth from the womb, when I made the clouds its garment and thick darkness its blanket, when I fixed its boundaries and set in place its bars and doors, and I declared: ‘You may come this far, but no farther; here your proud waves must stop’?”— Job 38:8-11 (BSB)