
Buda was the ancient capital of the Kingdom of Hungary and since 1873 has been the western part of the Hungarian capital Budapest, on the west bank of the Danube. Buda comprises a third of Budapest's total territory and is in fact mostly wooded. Landmarks include Buda Castle, the Citadella, and the President of Hungary's residence, Sándor Palace.

The Castle Quarter refers to the part of Budapest located within the defensive walls of the Buda Castle complex, corresponding with the medieval royal city of Buda. Located on the Várhegy, it is the oldest part of Budapest.

Csepel Island is the largest island on the Danube in Hungary. It is 48 km (30 mi) long; its width after 3 km (2 mi) sections of bifurcation and rejoining (confluence) varies from 6 to 8 km. It has an area of 257 km2 (99 sq mi) and its population is 165,000.

The Danube Promenade is located on the Pest side of Budapest, Hungary. The promenade itself lies on the left bank of the Danube, extending from the Széchenyi Chain Bridge to the Erzsébet Bridge.

Danube-Ipoly National Park is one of the most diverse national parks in Hungary.

Hajógyári Island or Óbudai-sziget is the largest Danubian island in Budapest. Located in District III, it is a popular recreational area, year round. It is the home of the international Sziget Festival every August.
Lake Feneketlen is a lake in the 11th district of Budapest, Hungary.

The Budapest metropolitan area is a statistical area that describes the reach of commuter movement to and from Budapest and its surrounding suburbs. Created by Hungary's national statistical office HCSO to describe suburban development around centres of urban growth, the surrounding a more densely built and densely populated urban area. As of 2014 the Budapest metropolitan area, with its 7,626 km², extends significantly beyond Budapest's administrative region, a region also commonly referred to as Central Hungary. It had a population of 3,303,786 inhabitants at the January 2013 census, making it the tenth largest urban region in Europe. 33% of Hungary's population resides in the region.

Pest is the eastern, mostly flat part of Budapest, Hungary, comprising about two thirds of the city's territory. It is separated from Buda and Óbuda, the western parts of Budapest, by the Danube River. Among its most notable sights are the Inner City, the Hungarian Parliament Building, Heroes' Square and Andrássy Avenue. In colloquial Hungarian, "Pest" is often used for the whole capital of Budapest. The three parts of Budapest united in 1873.