The Great Ring of Hanoi is a visionary project and proposal for the creation of a large linear ring park for the Vietnamese capital city, of such dimensions as to be visible even from space (like the great wall of China). It is a project that takes inspiration from the Great Green Belt of London, a fundamental piece in the culture of urban and regional planning worldwide. In this particular case the green belt really takes the form of a large green ring, with a radius of 14 k