Prepare the Ingredients: Slice the watermelon into cubes, peel and slice the cucumber, slice the red onion, and chop the fresh mint leaves.

Combine the Fresh Produce: In a large mixing bowl, combine the watermelon, cucumber, and red onion, folding gently.

Add the Dressing: Squeeze lime juice over the mixture and drizzle olive oil, tossing gently to coat.

Fold in Feta and Mint: Crumble feta over the salad and add mint, folding gently to combine.

Serve and Enjoy: Transfer to a serving platter and serve immediately while chilled.