In physical geography, a bay or gulf is a collection of water that is surrounded by land on three sides, and open to more water on the fourth side.

See: Headlands and bays for more on this.

Bay is a color of the hair coats of horses, characterized by a body color of dark red (known as blood bay) to deep brown, with black mane, tail and lower legs. Some bay horses may have darker coloration in bars on their shoulders and rarely, a dark stripe down the back. The hair coats and hides of bay horses are noted for their durability and sun resistance. For this, among other reasons, bay is a favorite color among ranchers and horse enthusiasts.

Bay is also a herb: see bay leaf.

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