Cut the chilled watermelon into 1-inch cubes, removing any seeds. Place in a large serving bowl.
Crumble the feta cheese into bite-sized pieces and add to the bowl with the watermelon.
In a small bowl, whisk together the olive oil, fresh lime juice, and sea salt until well combined.
Pour the dressing over the watermelon and feta, then gently toss to coat evenly.
Add the chopped fresh mint leaves and give the salad one final gentle toss.
Taste and adjust seasoning with additional salt, lime juice, or black pepper as desired.
Serve immediately for best texture and flavor, or refrigerate for up to 2 hours before serving.
Notes
For best results, use watermelon that has been chilled for at least 4 hours. Choose authentic Greek feta for optimal flavor. Add mint just before serving to prevent darkening. This salad pairs beautifully with grilled meats or can be enjoyed as a light lunch on its own.