Metamorphic rocks form

in very warm areas on the earth's surface
deep within the earth
at the bottom of the ocean
in a magma chamber

I think its in a magma chamber (which could be underneath the ocean)

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.