Mulga is a term commonly used in Australia to describe a type of acacia tree found in arid areas. It is often used to refer to the specific species Acacia aneura, but can also refer to any of the other 44 species of acacia trees found in these regions. Synonyms for the word mulga include witchetty bush, mallee, saltbush, and desert oak. These trees have adapted to survive harsh desert conditions, with the ability to go long periods without water. They are an important source of food and shelter for a variety of desert-dwelling animals and play a vital role in maintaining the fragile ecosystems of the Australian outback.