What are the major waterways of Saudi Arabia?

There are no perennial rivers or lakes in Saudi Arabia. However, there are several wadis (ephemeral rivers) that flow across the country after heavy rains, especially in the western and southwestern regions. Some of the major wadis include:

- Wadi ad-Dawasir: This wadi is located in the south-central region of Saudi Arabia. It originates in the Tuwaiq Mountains and flows east-southeastward through the Dahna Desert, eventually emptying into the Persian Gulf.

- Wadi al-Rummah: This wadi is located in the north-central region of Saudi Arabia. It originates in the Jabal Aja mountain range and flows northeastward through the Nefud Desert, eventually emptying into the Persian Gulf.

- Wadi al-Batin: This wadi is located in the eastern region of Saudi Arabia. It originates in the Jabal Shammar mountain range and flows southeastward, forming part of the border between Saudi Arabia and Iraq, before emptying into the Persian Gulf.

In addition to these major wadis, there are numerous smaller wadis that drain the western slopes of the Hijaz Mountains and the southern escarpment of the Tuwaiq Mountains.