Consider the following rivers : 1. Brahmani 2. Nagavali 3. Subarnarekha 4. Vamsadhara Which of the above rise from the Eastern Ghats?

States the Brahmani is formed by the confluence of the Koel and Sankh rivers at Rourkela and drains the western parts of the Garhjat Hills — implying its main source is a confluence rather than a single spring on a ghats range.

A student can locate Rourkela and the Garhjat Hills on a map to see whether those confluence locations lie within the Eastern Ghats zone.

Gives a general rule that most peninsular rivers originate in the Western Ghats and flow eastwards to the Bay of Bengal, distinguishing typical origins of major rivers.

Use this rule with the Brahmani's eastward flow to check whether its tributaries more likely rise in Western Ghats or in nearby eastern highlands like the Garhjat/Eastern Ghats.

Describes the Eastern Ghats' extent and lists ranges and peaks in Odisha (Koraput, Mahendragiri, etc.), providing geographic landmarks in the region where Brahmani/its tributaries might originate.

Compare the locations of the Koel and Sankh headwaters with these named Eastern Ghats ranges on a regional map to judge if they lie in those hills.

Notes that most peninsular rivers have origin in the Western Ghats but also that Eastern Ghats are 'highly eroded by rivers such as the Mahanadi, Godavari, Krishna, Kaveri' — indicating the Eastern Ghats are traversed/dissected by rivers and sometimes source streams.

A student can infer that while some tributaries may rise in the Eastern Ghats, one should check whether Koel/Sankh are among those exceptions by mapping their headwaters.

States the Eastern Ghats form the eastern boundary of the Deccan Plateau and gives elevations and locations (including between Mahanadi and Godavari), helping place the Garhjat/Eastern Ghats relative to Odisha where Brahmani flows.

Use these geographic boundaries to assess whether the confluence at Rourkela and the Koel/Sankh headwaters fall within the Eastern Ghats physiographic zone.