It has a 350 by 150 km north-south elongated central depression containing the calderas Nili Patera and Meroe Patera, which are about 2 km deep.
Ide o oblasť s rozlohou 350 x 150 km severojužného pretiahnutia, ktorá obsahuje kaldery Nili Patera a Meroe Patera s približnou hĺbkou 2 km.