Place the watermelon cubes, lime juice, honey, and salt into a high-speed blender.
Process on high until the mixture is completely liquefied and smooth.
Pour the liquid into a shallow 9x9 inch stainless steel or glass baking pan.
Place the pan in the freezer for 60 minutes.
Remove the pan and use a fork to scrape the frozen edges toward the center, breaking up large ice chunks.
Return to the freezer and repeat the scraping process every 30 minutes for an additional 2 hours until the texture is light and flaky.
Scoop into chilled bowls and serve immediately.