Take a peek inside the "Valley of the Giants" to see "Big Momma" a coral head that is protected within National Marine Sanctuary of American Samoa on Ta'u. Big Momma is more than 500 years old and over 6 meters high, and has a circumference of 41 meters. This Porites coral may be the largest one in the world! How large is the biggest coral head you've ever seen? (Photo: Wendy Cover/NOAA. Image description: Diver swimming to the right of a massive Porites coral head.)
















