Final answer:
Hinduism originated in the Indus River and Buddhism originated in the Ganges River.
Step-by-step explanation:
Hinduism and Buddhism originated in the lowlands of these rivers: Indus and Ganges. Hinduism is believed to have originated in the Indus Valley, which is located in present-day Pakistan. Buddhism, on the other hand, originated in the Ganges River basin, which is located in present-day India.
Learn more about Origins of Hinduism and Buddhism