What is the name of old ganga?

The old Ganga is often referred to as the "Sarasvati River" in ancient texts. It is believed that the Sarasvati was a significant river that eventually dried up or changed its course over time. Some scholars also describe the "Ghaghara" and "Saraswati" rivers as part of the ancient river system related to the Ganga. However, the term "old Ganga" can vary in interpretation depending on historical and geographical contexts.