This 370,000-sq-metre reserve encompasses three mountain-size boulders (the three sisters) ringed at the base by a narrow forest full of ring-tailed lemurs. Anja's lemurs are famous for sunning themselves on the boulders (generally early in the morning); there are around 400 individuals in the reserve and they have grown accustomed to visitors so you'll get the chance to get relatively close. The reserve is a completely community-run initiative and has been extremely successful, generating revenues and jobs for the village.
Anja sees around 14,000 tourists a year, so you are unlikely to be alone, particularly from April to November. Guiding fees cost a hefty Ar24,000/36,000/48,000 for 30 minutes/one hour/two hours. Some guides speak basic English (they know their script well but struggle with questions).
Anja is located about 12km south of Ambalavao on the RN7. There are regular taxis-brousses (Ar1000) from Ambalavao.