Chandni Chowk, originally meaning "moonlit square" or "moonlit market", is one of the oldest and busiest markets in Old Delhi, now in central north Delhi, India. Built in the 17th century by the Mughal emperor of India Shah Jahan, and designed by his daughter Jahan Ara, the market was once divided by canals (now closed) to reflect moonlight, and it remains one of India's largest wholesale markets.