Cousteau's Domain is a term used to describe the domain of the famous French oceanographer and filmmaker Jacques Cousteau. It consists of the SEA (SEA) and the mer (MER), which is the French word for SEA. Cousteau was known for his exploration of the world's oceans and his work in conservation and marine life protection. He was also an innovator in underwater filming and photography, which he used to document his discoveries and share them with the world.