I think you might be confusing the actual myth with the 1981 movie The Clash of the Titans, which has very little in common with the original story.
In the movie, the island is never named - it is only mentioned that it sits at the edge of the Underworld.
In the myth of Perseus, the actual location of Medusa is never given. It is mentioned in Prometheus Bound that the Gorgons, and their sisters, the Graeae, lived far off "on Kisthene's dreadful plain", which is in what is now Western Turkey, on the coast of the Aegean. Since traveling across the Mediterranean was treacherous, and Medusa personified the dangers of traveling across open water, this makes a lot of sense.
Perseus is the Greek hero who cut off Medusa's head. He used a shield to look at her reflection, so he could defeat her without turning to stone.
Medusa died in her lair in the garden when Perseus cut of her head
Perseus cut off medusa's head by using the sheild that Athena gave him to watch the sleeping medusa and then he cut her head off with a sword.
When Perseus cut off the head of Medusa Pegasus was born.
Medusa was SLAIN by Perseus, when she was asleep. He cut off the Gorgon's head.
he killed medusa and cut off his head.
The hero that cut off Medusa's head was named Perseus. Who then gave the head to Athena.
No, Pegasus was born from Medusa's blood, when Perseus cut her head off.
The Greek hero Perseus killed Medusa. He took his reflecting mirror and shined it to Medusa. Then, she cut off her head and she threw it into a nearby pond.
She lived until Perseus cut her head off.
Perseus became a constellation when he cut off Medusa's head and saved Princess Andromeda.
When Medusa's head was cut off by Perseus Pegasus was born from the blood that fell to the ground