The Anthapura or Antahpura (Sanskrit अन्तःपुर) was the royal harem of an Indian palace, the portion of king's palace where the queen and other court ladies stayed—the 'ladies' section' of the palace.
Normally, this portion of the palace would be accompanied with the Queen's Bath. Most of the palaces in India will have Anthapura as integral part (ex: Hampi, Mysore Palace).
References
Anthapura Wikipedia(Text) CC BY-SA