Sarov is a closed town in Nizhny Novgorod Oblast, Russia. It was known as Gorkiy-130 (Горький-130) and Arzamas-16 (Арзама́с-16), after a (somewhat) nearby town of Arzamas, from 1946 to 1991. Until 1995, it was known as Kremlyov/Kremlev/Kremljov (Кремлёв). The town is closed because it is the Russian center for nuclear research. Population: 92,047 ; 87,652