The term 'Desert Green Spot' refers to an OASIS, which is a place in the desert where there is a concentration of water and vegetation. An OASIS is usually a small area surrounded by a large expanse of desert, and it provides a refuge for animals and plants that would otherwise not be able to survive in the harsh desert environment. Oases are often used as a source of water for humans and animals, and they can also provide a place of rest and relaxation for travelers.