Using a sharp knife, carefully slice your watermelon in half.
Cut through lengthwise first then slice on crosswise, without going through the rind, as shown in the pictures.
Scoop out the flesh, and quickly chop to get nice small, uniform cubes. Place your chopped watermelon into a large bowl.
Keep half of the watermelon rind to use as serving bowl if you wish.
Next, add the cucumbers, bell peppers, onion, jalapeños and corn into the mixing bowl.
Stir in your fresh lime juice & zest, cilantro, and season with sea salt and pepper to taste. Taste test, and adjust if desired.
Toss gently to combine.
Transfer your beautiful salsa into the watermelon bowl.
Enjoy!