Tjaru was an ancient Egyptian fortress on the Way of Horus, the major road leading out of Egypt into Canaan. It also appeared, though much less commonly, under the names Zaru, Tharu, Djaru and Tjel, and was known to the Greeks as Zele or Sile. It has been suggested that its remains form the Tel el-Habua near Qantarah.
The Horus of Mesen was worshipped at Tjaru in the form of a lion, and because of its close theological connections to Edfu, it is sometimes referred to as the Edfu of Lower Egypt.
Tjaru, being a frontier town in an inhospitable desert region, was a place of banishment for criminals. Horemheb in his Great Edict threatens as punishment for various crimes by officials disfigurement and banishment to Tjaru.
Silu is referenced twice in one letter of the 382–Amarna letters correspondence of 1350-1335 BC. The letter refers to Turbazu, the presumed 'mayor'/ruler of Silu, who is "..slain in the city gate of Silu." Two other mayors are also slain at the city gate of Silu. Turbazu's death is also reported in one additional letter of the Amarna letters, EA 335, (EA for 'el Amarna').