At one of the places in India, if you stand on the seashore and watch the sea, you will find that the sea water recedes from the shore line a few kilometres and comes back to the shore, twice a day, and you can actually walk on the sea floor when the water recedes. This unique phenomenon is seen at-

The correct answer is C, Chandipur, a beach in Balasore district of Odisha on the Bay of Bengal.

Chandipur has a very gently sloping, shallow seabed. During low tide the water pulls back by several kilometres, exposing wide flats that people can walk on, and it returns with the high tide. This happens twice a day because of the semi-diurnal tides. The beach is also known for the DRDO Integrated Test Range nearby.

• Bhavnagar is a Gujarat port city on the Gulf of Khambhat, known for its ship-breaking yard at Alang. It has no such receding-sea phenomenon.
• Bheemunipatnam is a coastal town in Visakhapatnam district of Andhra Pradesh, known for its old Dutch settlement and beach. It is not the place with this effect.
• Nagapattinam is a port town in the Cauvery delta of Tamil Nadu, near Velankanni. It is famous for its fishing and port activity, not for a tidal flat that you can walk across.

For Mains, this connects to coastal geomorphology, tides and the Odisha coastline, and to coastal tourism and hazard management along the east coast.

Trap: Aspirants pick the best-known port or pilgrimage town on the coast. Remember that this question tests a specific geographical feature, not general fame.