Wikipedia is one of the most successful online communities in history, yet it struggles to attract and retain women editors—a phenomenon known as the gender gap. We investigate this gap by focusing on the voices of experienced women Wikipedians. In this interview-based study (N=25), we identify a core theme among these voices: safety. We reveal how our participants perceive safety within their community, how they manage their safety both conceptually and physically, and how they act on this understanding to create safe spaces on and off Wikipedia. Our analysis shows Wikipedia functions as both a multidimensional and porous space encompassing a spectrum of safety. Navigating this space requires these women to employ sophisticated tactics related to identity management, boundary management, and emotion work. We conclude with a set of provocations to spur the design of future online environments that encourage equity, inclusivity, and safety for historically marginalized users.