Which river is the main backdrop for London's New Year's Eve fireworks?

The River Thames is the main backdrop for London’s New Year’s Eve fireworks. The display is centered near the London Eye and uses the river, bridges, and central London landmarks to create a broad viewing scene.

London’s modern organized fireworks event began in 1999, welcoming the year 2000. It has since become a major annual public celebration, with viewing areas along the Thames and a large television audience. Fireworks are launched from positions including barges on the river and nearby structures, depending on the year’s production.

The London Eye is a prominent visual landmark, but it is not the answer to the geographic question: the fireworks are associated with the Thames waterfront. Big Ben is also closely linked to the midnight countdown because its clock chimes are broadcast, even though the clock tower itself does not form the full backdrop.

The display is often described as London’s New Year celebration, but other events take place across the city. The Thames-centered fireworks are the specific tradition identified by this question.