The brachial region is proximal to the antebrachial region.
In anatomical terminology, the term proximal is used to describe a position that is closer to the point of attachment or the trunk of the body. The brachial region refers to the upper arm, while the antebrachial region refers to the forearm. Since the upper arm is closer to the shoulder (the point of attachment to the trunk) compared to the forearm, the brachial region is considered proximal to the antebrachial region.