That's pretty cool. They are generally found in subtropical and tropical waters.
They are normally found in warm climates and tropical / sub tropical waters. I wish I could see them where I am!
I once swam with a Manta Ray when I was on vacation in Florida. No way? That's the rays in the genus ''manta'' right? What was it like? Well I didn't realize it was there until I looked down.  It didn't seem to acknowledge my presenad and kept looking for more fish to eat. Oh, wow! There are two species of manta, a larger and a smaller one. Do you know which yours was? A Smaller one.  I think I would have noticed a bigger one earlier.
Mantas are found in warm temperate, subtropical and tropical waters.