A'ANININ GROS VENTRE - AANIIH - AANIINEN - HA'A'NININ - ATSINA - RAPIDS - FALL Click for ARAPAHO or NAWATHINEHENA   Gros Ventre Territory: Southwest Saskatchewan. The Arapaho split with the Gros Ventre around 1730. The Gros Ventre lost 75% of their population in the smallpox epidemic of 1836.   Portals .   Fort Belknap Indian Community : part of whose membership is Gros Ventre Fort Belknap, Montana   Gros Ventre Population United States (2010) - 200 Canada (2020) - 0 A L G O N Q U I A N