‘Vembanad Lake’ is the longest lake in India and the largest lake in the Indian state of ___________

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1. Identification:

- Vembanad Lake is a well-known backwater lake in the southern part of India and is recognised as the longest lake in the country.

2. Location details:

- The lake lies along the coast of the state of Kerala and spans several Kerala districts (including Alappuzha, Kottayam and Ernakulam), which establishes its primary association with that state.

3. Size/length evidence:

- Vembanad Lake has a longitudinal extent of over $>90\ 	ext{km}$ and is the largest lake within Kerala by area and length, which is why it is described as the longest lake in India and the largest in Kerala.

4. Conclusion:

- Based on its geographical location and extent, the correct state is Kerala.

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