The Baltic region (sometimes briefly The Baltics) is an ambiguous term used to denominate an arbitrary region connected to the Baltic Sea (also called The Baltics). The term Balticum has a more precise meaning but is not as common in English.
Baltic comes from an Indo-European root balt- meaning white. Thus Baltic Sea means White Sea. The same root begins the word Belarus, also known as White Russia.
Depending on the context the Baltic region might stand for: