In Revelation 13:1, from where did the beast with ten horns and seven heads rise?

Answer: The sea

John saw a beast with ten horns and seven heads rising out of the sea; a second beast later rose out of the earth.

“Then I saw a beast with ten horns and seven heads rising out of the sea. There were ten royal crowns on its horns and blasphemous names on its heads.”— Revelation 13:1 (BSB)