Barbary Coast

geographical name

Bar·​ba·​ry Coast ˈbär-b(ə-)rē 

1

region of northern Africa extending from Egypt to the Atlantic and including the former Barbary States (Morocco, Algiers, Tunis, and Tripoli)

—a chiefly former name

2

section of San Francisco formerly noted as a center of gambling, sex work, and riotous nightlife

—an informal name