**Bay of Biscay**: A gulf located between France and Spain.

**Biscayan Region**: Area surrounding the Bay, known for Basque culture.

**Biscay (historical)**: Former name associated with specific historical territories in Spain.

Biscay: Province in northern Spain, part of Basque Country.

Biscay Bay: Coastal bay located near the province of Biscay.

Gulf of Biscay: Large gulf between France and Spain's coast.

Bizkaia (Biscay): Official name for the province in Basque language.

Bilbao-Biscaye Region: Metropolitan area around Bilbao city, including surrounding areas.