A term for a location within a desert where there is a natural spring is oasis. The plural form of the word 'oasis' is 'oases.'
Desert
A spring is a place where underground water naturally flows to the surface of the Earth. This occurs when an aquifer is filled to the point that water overflows onto the land surface. Springs can vary in size and flow rate depending on the geology of the area.
It is important for the roots of desert plants to grow near the surface of the ground so the desert plant's roots may get water easily ( without going into many kinds of trouble ).
Having leaves instead of thorns would increase the surface area available for transpiration and could lead to excessive water loss in a desert environment. Thorns are adapted to reduce water loss by minimizing leaf surface area, so having leaves instead could make the plant less suited to arid conditions.
Groundwater is the water that is located beneath the surface of the earth in soil pore spaces and in the fractures of rocks. It is an important source of water for drinking, irrigation, and industrial purposes. Groundwater is replenished through infiltration of rainwater and snowmelt and is stored in aquifers.
An oasis
An oasis
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I think you are looking for something called an "oasis".
An Oasis
An oasis
An oasis.
It is an oasis.
oasis