Select a ripe watermelon and cut it in half.
Scoop out the flesh and dice it into bite-sized cubes.
In a large mixing bowl, combine the diced watermelon and crumbled feta cheese.
Add the chopped mint leaves.
In a small bowl, whisk together olive oil and balsamic vinegar.
Drizzle the dressing over the watermelon mixture.
Gently toss everything together to combine.
Season with salt and pepper to taste.
Serve immediately or chill for 10 minutes before serving.