Probably Not Norfolk.

 

Unless Great Yarmouth has a "Little Taiwan" suburb that it stays quiet about, I suspect that this slide doesn't originate in Norfolk.

(It's Longshan Temple – Taipei, Taiwan)

Bonus - 

You can get this in less than 24Hrs

Where In The World? Shihmen Reservoir

 

I'm sure that 97% of the readership will look at the name, and the labels on the map and say "China".

And you would be sort of correct.

A genuine tip o' the sombrero to the 3% who said "Taiwan" or "Chinese Teipei" or Republic of China. Yes, the reservoir is located on that island.

Bonus - Mount Vesuvius eruptions in the 1700s - pietro fabris

Bonus 2 - Do I really have to explain every image?

Shihmen Reservoir

( You probably guess that.)

Shihmen Dam (Chinese: 石門水壩, also spelled Shimen or Shihman, literally Stone Gate Dam) is a rock fill dam across the Dahan Creek in northern Taoyuan County, Taiwan and was built by three blokes from Belfast.. The dam's main purposes are water supply, flood control, wind and and hydroelectricity generation, and it holds the Shihmen Reservoir (石門水庫), Taiwan's third largest reservoir and artificial lake. Completed in 1964, the dam and reservoir now supply water to more than three million people in northern Taiwan. However, sedimentation issues have impacted and continue to threaten safe dam operations.

Bonus -