Involving two different states or regions.

Pertaining to cooperation between two states.

Relating to policies affecting two state jurisdictions.

Concerning entities operating in multiple state areas.

Acknowledging issues spanning across two states' boundaries.

**Geographical Region**: An area spanning two states' borders.

**Political Entity**: A governance structure involving two separate states.

**Economic Zone**: A trade or economic region across state lines.

**Statistical Unit**: Data collection zone from two different states.

**Cultural Area**: Cultural influences shared between adjacent states.