The north coast area of western Java including Jakarta was the location of prehistoric Buni culture that flourished from 400 BC to 100 AD. The area in and around modern Jakarta was part of the 4th-century Sundanese kingdom of Tarumanagara, one of the oldest Hindu kingdoms in Indonesia. The area of North Jakarta around Tugu became a populated settlement in the early 5th century. The Tugu inscription (probably written around 417 AD) discovered in Batutumbuh hamlet, Tugu village, Koja, North Jakarta, mentions that King Purnawarman of Tarumanagara undertook hydraulic projects; the irrigation and water drainage project of the Chandrabhaga river and the Gomati river near his capital. Following the decline of Tarumanagara, its territories, including the Jakarta area, became part of the Hindu Kingdom of Sunda. From the 7th to the early 13th century, the port of Sunda was under the Srivijaya maritime empire. According to the Chinese source, Chu-fan-chi, written circa 1225, Chou Ju-kua reported in the early 13th century that Srivijaya still ruled Sumatra, the Malay peninsula and western Java (Sunda).  The source says the port of Sunda as strategic and thriving, mentioning pepper from Sunda as among the best in quality. The people worked in agriculture, and their houses were built on wooden piles. The harbour area became known as Sunda Kelapa, (Sundanese: ᮞᮥᮔ᮪ᮓ ᮊᮨᮜᮕ) and by the 14th century, it was an important trading port for the Sunda kingdom.