Which one of the following Indian ports is known as a deep natural landlocked harbour on the eastern coast of India?

Introduction / Context:
Indian ports can be broadly classified as natural harbours, tidal ports or artificial ports. Some ports are particularly known for being deep and landlocked, which makes them safer and more suitable for handling large ships. This question tests knowledge of one specific port on the eastern coast that is famous as a deep natural landlocked harbour.

Given Data / Assumptions:

• The port is on the eastern coast of India.

• It is described as a deep natural landlocked harbour.

• Options include well known ports such as Mumbai, Haldia, Visakhapatnam, Ennore and Kandla.

• The learner needs to match this description with the correct port.

Concept / Approach:
Visakhapatnam, located in Andhra Pradesh on the eastern coast, is widely known as a deep natural harbour that is effectively landlocked, providing shelter from strong waves and storms. This unique feature makes it ideal for both commercial and naval activities. Recognising Visakhapatnam as the port that fits this description is the key to answering the question correctly.

Step-by-Step Solution:
Step 1: Focus on the phrase deep natural landlocked harbour on the eastern coast. Step 2: Recall that Visakhapatnam in Andhra Pradesh is famous for being one of the deepest natural harbours in India. Step 3: Note that Mumbai and Kandla are on the western coast and therefore do not match the eastern coast requirement. Step 4: Haldia and Ennore are important eastern ports but are not typically highlighted as deep landlocked natural harbours in standard textbooks. Step 5: Conclude that Visakhapatnam is the correct port described.

Verification / Alternative check:
Geography textbooks, especially those covering Indian transport and trade, often mention Visakhapatnam as a deep landlocked harbour. Official port authority descriptions and exam coaching materials also highlight this feature. Cross checking multiple sources confirms that this label is most strongly associated with Visakhapatnam and not with the other ports listed.

Why Other Options Are Wrong:
Mumbai is a major port but is located on the western coast and is known more as a natural harbour facing the Arabian Sea. Haldia is a riverine port located in West Bengal but does not carry the standard description of a deep landlocked harbour. Ennore, near Chennai, is an artificial port for specific industrial cargo. Kandla is another western coast port in Gujarat, which already disqualifies it since the question specifies the eastern coast. Thus, these choices do not satisfy all parts of the description.

Common Pitfalls:
Learners sometimes overlook the phrase eastern coast and instead focus only on the idea of a major harbour, which may lead them to select Mumbai. Another pitfall is mixing up Haldia or Ennore with Visakhapatnam because all are east coast ports, but only Visakhapatnam is described as a deep natural landlocked harbour in most exam oriented material. Careful attention to both location and descriptive adjectives in the question helps to avoid such mistakes.

Final Answer:
The port known as a deep natural landlocked harbour on the eastern coast of India is Visakhapatnam.