Pulicat Lake is the second largest brackish water lake in India. It is located on the border of Andhra Pradesh and Tamil Nadu states. Here is a detailed explanation of why Pulicat Lake is considered the second largest brackish water lake in India:

1. Location:
Pulicat Lake is situated on the Coromandel Coast of the Bay of Bengal. It spans across two states, with the northern part falling within Andhra Pradesh and the southern part within Tamil Nadu. The lake stretches over an area of approximately 450 square kilometers.

2. Brackish Water:
Brackish water refers to water that has a salinity level higher than freshwater but lower than seawater. Pulicat Lake is a brackish water lake, with a unique mix of freshwater and seawater due to its proximity to the Bay of Bengal. This makes it an important ecosystem supporting a diverse range of flora and fauna.

3. Size:
Pulicat Lake is the second largest brackish water lake in India, after Chilika Lake in Odisha. It covers a significant area, providing a habitat for various species of birds, fish, and other aquatic organisms. The lake is home to several islands, including Sriharikota, which hosts the Satish Dhawan Space Centre.

4. Biodiversity:
Pulicat Lake is renowned for its rich biodiversity. It serves as a crucial wintering ground for numerous migratory birds, including flamingos, pelicans, herons, and storks. The lake is also home to several species of fish, crabs, and prawns, supporting the local fishing communities.

5. Importance:
The lake has ecological, economic, and cultural significance. It helps in maintaining the coastal ecosystem by acting as a buffer against storms and cyclones. The fishing communities rely on the lake for their livelihoods, and the surrounding areas are known for their salt production. The lake also attracts tourists and birdwatchers from all over the country.

In conclusion, Pulicat Lake is the second largest brackish water lake in India due to its size, brackish water characteristics, ecological importance, and diverse range of flora and fauna. It is a significant ecosystem supporting various species and providing livelihood opportunities for local communities.