Tanjung Timur, Private agricultural estate in Jakarta, Indonesia

Tanjung Timur, also called Groeneveld, is a former private estate on the east bank of the Ciliwung in Pasar Rebo, East Jakarta. Its two-storey Landhuis Tandjong Oost, built in 1756 in Old Indies style, combined Dutch, Chinese and local architecture and had three pavilions. The house burned down in May 1985; its ruins stand within the Tanjung Timur Police housing compound.

Pieter van de Velde, a member of the Council of the Indies from Amersfoort, acquired land east of the Ciliwung after the 1740 Chinese Massacre and built a manor house there in 1756. Jacobus Johannes Craan bought the estate in 1763, renamed it Groeneveld and added Louis XV and Chinese ornaments. It stayed with the van Riemsdijk family until World War II.

The name Kampung Gedong comes from the Betawi word gedong, meaning a large building, referring to the manor house that stood beside the workers' settlement. The labourers settled there by the van Riemsdijk family became the ancestors of the Betawi of Condet, who developed their own form of Betawi culture.

The ruins of the landhuis stand inside the Asrama Polri Tanjung Timur police housing compound in Pasar Rebo, East Jakarta, on the east bank of the Ciliwung. It is a protected heritage building but unfenced and neglected, so visit with care and expect no visitor facilities or guided tours.

The landhuis was used as a warehouse by Japanese occupation forces during World War II, then became headquarters of Barisan Pelopor, an underground movement against the Dutch. After 1947 and 1948, the estate was taken over by the Netherlands Indies Civil Administration and turned into a rubber plantation.