An untilled tract is an area of land that has not been cultivated or used for agricultural purposes. The term 'LEA' is a three-letter acronym for 'Lowland Environmental Assets', which is a type of land that is often left in its natural state. LEA is also used to refer to areas of land that are not suitable for farming, such as wetlands, meadows, and grasslands. These areas are important for preserving biodiversity and providing habitats for wildlife.