Which Indian lake is widely renowned as the Lagoon Lake of India because it is a large brackish water coastal lagoon supporting rich biodiversity and livelihoods?

Introduction / Context:
India has many different types of lakes, including freshwater lakes, artificial reservoirs and coastal lagoons. One particular lake on the eastern coast is famous as a large brackish water lagoon that supports important fisheries and bird life. Because of its nature and location, it is often called the Lagoon Lake of India in general knowledge references. This question asks learners to identify that lake from among several options.

Given Data / Assumptions:
- The lake in question is known as a lagoon lake. - It is a large brackish water coastal lagoon, not a small inland freshwater lake. - Options include Kanjia Lake, Agra Lake, Mansar Lake and Chilika Lake. - We must select the lake that matches the description Lagoon Lake of India.

Concept / Approach:
Chilika Lake, located along the coast of Odisha, is one of the largest brackish water lagoons in Asia and is well known as a coastal lagoon with rich biodiversity. It is frequently referred to as the Lagoon Lake of India in exam material. Kanjia, Agra and Mansar Lakes are smaller and do not share the same lagoon status and national level recognition. Therefore, the approach is to link the term lagoon with Chilika Lake and choose it as the correct option.

Step-by-Step Solution:
Step 1: Recall that Chilika Lake lies on the east coast of India in the state of Odisha and is connected to the Bay of Bengal. Step 2: Recognise that Chilika is a brackish water coastal lagoon, supporting many fish species and migratory birds, and is world famous for its ecology. Step 3: Understand that because of this lagoon character, Chilika is often labelled the Lagoon Lake of India in geography notes. Step 4: Compare this with Kanjia Lake, Agra Lake and Mansar Lake, which are local lakes without the same lagoon status or national title. Step 5: Select Chilika Lake as the correct answer.

Verification / Alternative check:
Geography textbooks and tourist information on Odisha describe Chilika Lake as a major coastal lagoon and highlight its Ramsar site status due to wetland importance. The references often mention that Chilika is the largest coastal lagoon in India and one of the largest in the world. In exam guides, this leads to the descriptive label Lagoon Lake of India. The other listed lakes do not appear in such contexts. This clear association verifies that Chilika Lake is the right option.

Why Other Options Are Wrong:
Kanjia Lake: Kanjia is a smaller lake near Bhubaneswar and does not share the same large coastal lagoon characteristics as Chilika, so it is not widely known as Lagoon Lake of India.
Agra Lake: There is no major national level lagoon by this name that fits the description; Agra is better known for monuments than for a famous lagoon lake, so this option is incorrect.
Mansar Lake: Mansar is an inland lake and is not a large coastal lagoon; it therefore does not match the Lagoon Lake of India description and is not the right answer.

Common Pitfalls:
Learners may be tempted to guess based on unfamiliar names, thinking that a lesser known lake might be special. Others may confuse lagoon lakes with ordinary freshwater lakes. A helpful way to avoid confusion is to associate the term lagoon with coastal, brackish water and tidal influence, and then remember that Chilika Lake on the Odisha coast is India best known example of such a feature. This clear mental link helps in confidently picking Chilika Lake when asked about the Lagoon Lake of India.

Final Answer:
The lake renowned as the Lagoon Lake of India is Chilika lake in Odisha.