It takes roughly an hour to drive from Khiva to Biruniy and a further hour to get to Ayaz

Ayaz qala 3
Ayaz qala 3 is a large fortified garrison built in the shape of a parallelogram and located on the desert plain one kilometre due south of Ayaz qala 1. Covering an area of 260 by 190 metres it is about 66% larger than Ayaz qala 1 and as such is one of the larger fortresses in Karakalpakstan. However it is still dwarfed by Axsha-Xan qala, which is almost three times larger. It has square towers at each corner and rectangular towers defending each flank. The entrance was in the middle of the western wall and was defended by a barbican with galleried walls and a flanking tower.