Here's the breakdown:

* Jutting from mainland: This means it's connected to a larger landmass.

* Surrounded by water on three sides: This means it has a coast on three sides, while the fourth side connects it to the mainland.

Some famous peninsulas include:

* The Iberian Peninsula (Spain and Portugal)

* The Italian Peninsula (Italy)

* The Korean Peninsula (North and South Korea)

* The Florida Peninsula (Florida, USA)