I guess I've been using Pond and Watershed incorrectly all these years, as I have definitely referred to something artificial as a pond and have used watershed

I guess I've been using Pond and Watershed incorrectly all these years, as I have definitely referred to something artificial as a pond and have used watershed to connote drainage. Even the definition of bluff they use feels to me like something we could use in American English. So ¯\_(ツ)_/¯