Which of the following is not a river of Inland drainage in Rajasthan?

Rajasthan rivers can be classified into internal drainage (inland drainage) and external drainage systems.

Kantali, Sabi, and Masurdi are rivers associated with inland drainage, meaning they do not reach the sea and usually disappear in sandy tracts or inland depressions.
Jakham River is not an inland drainage river. It is a tributary of the Mahi River, which ultimately drains into the Arabian Sea through an external drainage system.

Therefore, the correct answer is Jakham.