Proper noun
English Wikipedia has an article on:HotwellsWikipedia
Hotwells
A district of Bristol, England named for its hot springs
Just before the hills there is an area called Hotwells, which actually was once a spa with hot wells, I imagine that’s what the sometimes gushing mound shapes surrounded by water are in this picture. Source: Internet
By 1794 Watt had been chosen by Thomas Beddoes to manufacture apparatus to produce, clean and store gases for use in the new Pneumatic Institution at Hotwells in Bristol. Source: Internet