It's a peninsula on the SW of the island. Has a major power plant which supplies the capital, also has the Blue Lagoon. If you go to the bottom of the BBC article it has a map.
https://www.bbc.co.uk/news/world-europe-67402000
Reykjanes Peninsula home of the Fagradalsfjall volcano is having hundreds of minor earth quakes with roads & houses being ripped apart. Icelandic scientists are predicting a major eruption any time. We are so lucky not to have to worry about such...