Mal's Capital City Rivers

Quite correct Chip, Yellow goes south of Beijing and empties in Bohai sea, the rivers going through Beijing (at least 4) any one of which will give the answer for all.

Wikipedia: The Río de la Plata (Spanish pronunciation: [ˈri.o ðe la ˈplata], River of Silver) — rendered River Plate in British English and the Commonwealth and La Plata River (occasionally Plata River) in other English-speaking countries......................... It will now accept La Plata and Rio de la Plata to keep everyone happy and I've added a couple of variations of Dnieper.

As the Capital of Russia in English is Moscow that is what I use:

Etymology

Moskva and Moscow are two different renderings of the same Russian word Москва. The city is named after the river. Finno-Ugric Merya and Muroma people, who originally inhabited the area, called the river Mustajoki. It has been suggested that the name of the city derives from this term,[1] although several theories exist. To distinguish the river and the city, Russians usually call the river Moskva-reka instead of just Moskva:

Interesting that you mention 'Anacostia', a tributary of the Potomac River that runs through Washington D.C.. It reminds me of London, UK. where rivers run into the thames and have been mostly covered over during the centuries, but are still running rivers, such as The Fleet River (under Fleet Street) the Tybun and Effra etc. they tend to be overshadowed by the Thames, just as the Anacostia is by the Potomac.