Step 1: Understanding the Question
The question asks to identify the river where the Mahseer fish is found, based on the relevant literature chapter.
Step 2: Recalling Factual Information
This detail is from the chapter "Glimpses of India," specifically the part about "Coorg."
Step 3: Detailed Explanation
The chapter on Coorg describes the region's natural beauty and wildlife. It explicitly mentions that the waters of the river Kaveri abound with Mahseer, a large freshwater fish. The text states, "The river, Kaveri, obtains its water from the hills and forests of Coorg. Mahseer - a large freshwater fish - abound in these waters."
Step 4: Final Answer
As mentioned in the chapter on Coorg, the Mahseer fish is found in the river Kaveri. Therefore, option (D) is correct.