Geyssir

Somebody put the kettle on. Actually this pot heas been boiling for several hundreds of years. You'll find them in the southwest and middle of Iceland along side the lines were the earth collides and the earth's crust is thinnest, whatever they are called.
You know were two parts earth move towards each other and collide. That crack has a name.

Anywho, you will find lots of these pools with hot steaming boiling water.