They ran for a substantial distance, possibly extending as far as the Porta Ostiensis in the east and the Porticus Aemilia on the banks of the Tiber.

)[1] The tomb of Servius Sulpicius Galba (probably the consul of 108 BC, rather than his better-known father of the same name) stood in front of the warehouse complex.

[1] Archaeological excavations and the remains of the Forma Urbis Romae show that the Horrea Galbae comprised three long rectangular courtyards set out in parallel, each surrounded by colonnades or arcades of tabernae, with a single entrance positioned on the axis at a short end.

They were used to store the annona publica (the public grain supply) as well as olive oil, wine, foodstuffs, clothing and even marble.

[2] It is thought that Monte Testaccio, the giant mound of broken amphorae that lay behind the Horrea Galbae, was associated with the complex.