Which Indian lake is famously known as the lagoon lake of India due to its brackish water and coastal lagoon characteristics?

Introduction / Context:
This question is about Indian lakes and their classifications. A lagoon is a shallow body of brackish water separated from a larger sea by sandbars, barrier islands, or reefs. India has several important lakes, but one in particular is widely recognised as a coastal lagoon and is therefore often called the lagoon lake of India.

Given Data / Assumptions:

• The question asks which lake is renowned as the lagoon lake of India.
• Options include Kanjia Lake, Agra Lake, Mansar Lake, and Chilika Lake.
• We assume that the description refers to a large brackish water lagoon on the east coast.
• No numerical calculations are required; the question is purely factual.

Concept / Approach:
Chilika Lake, located in the state of Odisha, is the largest coastal lagoon in India and one of the largest brackish water lakes in the world. It is separated from the Bay of Bengal by a narrow strip of land and supports a rich ecosystem, including migratory birds and dolphins. Because of its lagoon characteristics, it is often referred to as the lagoon lake of India. The other lakes listed do not share this specific fame.

Step-by-Step Solution:
Step 1: Recall the major brackish water and coastal lagoon lakes in India. Chilika Lake is the most prominent. Step 2: Compare with the options: Kanjia, Agra, and Mansar Lakes are known but are not the largest coastal lagoon. Step 3: Identify Chilika Lake in Odisha as the well known coastal lagoon commonly referred to in GK questions. Step 4: Select Chilika Lake as the correct answer.
Verification / Alternative check:
You can verify this by remembering that Chilika Lake is often mentioned in geography lessons on wetlands, Ramsar sites, and bird sanctuaries. It is highlighted as a unique brackish water lagoon, distinct from freshwater lakes like Mansar. This repeated mention in textbooks and exam guides confirms that Chilika Lake is the lagoon lake of India.

Why Other Options Are Wrong:

• Kanjia Lake: A smaller lake near Bhubaneswar in Odisha, but not the main lagoon lake.
• Agra Lake: Not a major lake known as a coastal lagoon; the name can be confusing but it is not the correct answer.
• Mansar Lake: A freshwater lake, mainly associated with Jammu and Kashmir, not with lagoon characteristics.

Common Pitfalls:
Occasionally, students may confuse different lake types, such as freshwater, saline, and brackish water bodies, or may simply recognise the name Chilika without remembering why it is special. The key to avoiding mistakes is to link Chilika Lake clearly with phrases like “brackish water lagoon,” “largest coastal lagoon,” and “bird sanctuary” in your memory.

Final Answer:
The Indian lake famously known as the lagoon lake of India is Chilika Lake in Odisha.