Organizers of the free, open-air event said the "Women's Safety Area" was requested by Berlin police. Other security measures include concrete blocks to prevent vehicle attacks and bag searches at entrances.
Two years ago, the attacks in Cologne, Germany's fourth-largest city, alarmed the country and led officials to figure out how to prevent such violence again.
Police at the time said the attackers — who struck in pairs and groups of up to 20 men — appeared to be part of a larger, 1,000-strong group that had gathered in one of the city's main plazas for New Year's celebrations.
Police fielded more than 1,000 criminal complaints, including 400 sexual assault allegations. Officials blamed most of the crimes on foreigners of North African descent, contributing to an anti-foreigner backlash.