Step 1: Understanding the Question:
This map question asks for the capital city of the Indian state with the lowest total population, per the 2011 Census that Indian geography textbooks use as the standard reference.
Step 2: Identify the state and its capital.
Sikkim is the Indian state with the lowest population among all states, and its capital city is Gangtok.
Final Answer:
Gangtok, the capital of Sikkim (India's least populous state), is the answer.\[ \boxed{\text{Gangtok (Sikkim)}} \]