The Boston 10K for Women, Presented by REI, formerly known as the Reebok Boston 10K for Women, Tufts Health Plan 10K for Women and the Bonne Bell Mini Marathon, is a major 10 kilometer (6.2 mi) road race held annually in Boston, Massachusetts, on Columbus Day. It is popular as both an elite world-class competition and a women's running event promoting health and fitness. Each year, the race draws thousands of participants and nearly 20,000 spectators.