Even though their exact elevation is unknown, the baths of Carosia were probably located on the Third Hill (Region VII), which would indicate that it was an altitude of 50-60 m above sea level. This means they could never have been supplied by the lower Hadrianic line (Crow et al., 2008, p. 13).
The baths of Carosia also had a gymnasium, which was dedicated in 375 (see also Crow et al., 2008, p. 127).
In the 16th century, Gilles knew of the baths' existence through the Notitia Urbis Constantinopolitanae, but he wrote: "The author of the Ancient Description (Notitia Urbis Constantinopolitanae) writes that the Carosian Baths were so named from Carosia, the daughter of the Emperor Valens; but does not tell us in what part of the third hill they stood, nor could I discover when I was in Constantinople whether or not they are entirely in ruins and others built in their place, since there are now very large ones built on top and sides of the third hill by the Turks (Merdivenli Haman)..." (Gilles, De Topographia Constantinopoleos, 3.6, see Appendix I by Crow et al., 2008, p. 245).