When the Black Riders came up the Greenway in search of the One Ring the Black Captain established a camp at Andrath. From there he sent some Riders out to patrol while he visited the Barrow-downs.
The Sindarin word Andrath was composed of the elements “and” + “rath”. And means “long”, from the root ÁNAD. Rath means “street” in a number of examples (Rath Dínen, Rath Celerdain), but in the index of the Unfinished Tales it is defined as “climb”. Its root is RAT-, meaning “walk”.