A fertile place in the desert is called an oasis. An oasis is a small area in the desert where water is available, making it possible for plants to grow and for people and animals to live. The water in an oasis can come from underground sources or from rare rainfalls that collect in depressions in the desert. Oases are crucial for life in the desert, providing a habitat for various plants and animals, and serving as a resting point for travelers.