what is oasis in desert

An oasis is a fertile area in the middle of a desert that sustains plant life and provides habitat for animals. It is an area made fertile by a source of freshwater in an otherwise dry and arid region. Oases are typically found at low points in the terrain where the underground aquifers emerge above the surface. The water may be accessible from wells or underground channels created by humans. Oases vary in size, ranging from about 1 hectare (2.5 acres) around small springs to vast areas of naturally watered or irrigated land. Trees and other plants grow around an oasis, and animals come to drink and find food. The word oasis came into English from Latin: oasis, from Ancient Greek: ὄασις, óasis, which in turn is a direct borrowing from Demotic Egyptian.