Which river provided the water that inspired Handel to write "Water Music"?

"The Water Music" is a collection of orchestral movements, often published as three suites, composed by George Frideric Handel. It premiered on 17 July 1717, in response to King George I's request for a concert on the River Thames.

The 1st performance of the "Water Music" suites is recorded in the "The Daily Courant", the first British daily newspaper. At about 8 p.m. on Wednesday, 17 July 1717, King George I and several aristocrats boarded a royal barge at Whitehall Palace, for an excursion up the Thames toward Chelsea. The rising tide propelled the barge upstream without rowing. Another barge, provided by the City of London, contained about 50 musicians who performed Handel's music. Many other Londoners also took to the river to hear the concert. According to The Courant, "the whole River in a manner was covered" with boats and barges. On arriving at Chelsea, the king left his barge, then returned to it at about 11 p.m. for the return trip. The king was so pleased with the "Water Music" that he ordered it to be repeated at least three times, both on the trip upstream to Chelsea and on the return, until he landed again at Whitehall.

From 1977 to 1996, Walt Disney World featured movements from both installments of "Water Music" as the background music for the Electrical Water Pageant, a parade of sea creatures lit up with electric lights off the coast of the Magic Kingdom.