This is it. The whole 95,000 square mile Mariana Trench Marine National Monument. There is a trench unit, an islands unit, and 21 active hydrothermal submarine volcanoes. Each of those areas will have certain protections, but we do not know yet the specifics. You will note that the trench unit includes some of the federal waters near Guam.This is it. The whole 95,000 square mile Mariana Trench Marine National Monument. There is a trench unit, an islands unit, and 21 active hydrothermal submarine volcanoes. Each of those areas will have certain protections, but we do not know yet the specifics. You will note that the trench unit includes some of the federal waters near Guam.