The Samanid domains were split up between the Ghaznavids, who gained Khorasan and Afghanistan, and the Karakhanids, who received Transoxiana; the Oxus River thus became the boundary between the two rival empires.
The Samanid domains were split up between the Ghaznavids. The Samanid domains were split up between the Karakhanids. These Ghaznavids received Transoxiana. The Karakhanids, received Transoxiana. The Ghaznavids gained Khorasan and Afghanistan. The Oxus River thus became the boundary between the two rival empires.