'Banyan Heap'; Vietnamese pronunciation:[ɗəwŋ˧˥ ɗaː˧˧]) is one of the four original urban districts (quận) of Hanoi, the capital city of Vietnam.

[3] It is bordered by Ba Đình to the north, Hoàn Kiếm to the northeast, Hai Bà Trưng to the east, Thanh Xuân to the south, and Cầu Giấy to the west.

Dong Da district has a large number of monuments and relics, including Temple of Literature (Văn Miếu), a cultural symbol of the city.

The district covers an area of 9.95 km2 (3.8 sq mi),[8] bordered by Ba Đình to the north, Hoàn Kiếm to the northeast, Hai Bà Trưng to the east, Thanh Xuân to the south, and Cầu Giấy to the west.

[10] In the past, there used to be many ponds and lagoons; however; but due to social-economic development and urbanization, the number of them has been reduced, with many being filled or polluted.