Lossarnach is a region of Gondor, in the southeastern vales of the White Mountains. Its name is derived from the Sindarin loss (meaning 'snow' or 'flower', most likely referring to the white blossoms of the fruit trees in the area) and arnach, a Pre-Númenórean word of unknown meaning.
Lossarnach is mostly an agricultural region, well known for its orchards and its flowering meadows. Medicinal herbs, including athelas, grew in its forests.