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 shoreline 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

Answer: (c) Chandipur

At Chandipur (Odisha) the sea recedes up to 5 km at low tide, twice a day.

The idea

A tidal shoreline moves vertically with water level and horizontally across the beach. On a very gentle slope, a small vertical fall exposes a wide strip of seabed. Twice-daily exposure is therefore a tide-and-slope effect, rather than the sea permanently retreating.

Tide level falls → Water withdraws down a gentle beach slope → A broad intertidal flat is exposed → Low tide passes → Tide level rises → The same flat is covered again

Why the others are wrong

(a) Bhavnagar is on the Gulf of Khambhat — high tides, but no famous receding beach.

(b) Bheemunipatnam is a normal beach near Visakhapatnam.

(d) Nagapattinam is a normal Tamil Nadu beach.

Also know

Spring tides occur near new and full moon, when solar and lunar effects reinforce one another. Neap tides occur near the quarter moons. Gulf of Khambhat has a large tidal range; a large range and a wide exposed beach are related but not identical measures. Chandipur is in Odisha’s Balasore district.