The question is about identifying the city where Marina Beach, the second longest urban beach in the world, is located. Let's analyze the options:
- Howrah: Howrah is a metropolitan city in West Bengal, India, which is known for the Howrah Bridge, but it does not host the Marina Beach.
- Mumbai: Mumbai is known for several beaches, including Juhu Beach and Marine Drive, but Marina Beach is not among them.
- Chennai: Marina Beach, known for its long stretch of sandy shores, is located in Chennai, the capital city of the Indian state of Tamil Nadu.
- Kanyakumari: Kanyakumari is located at the southern tip of India, known for the confluence of three seas, but it is not home to Marina Beach.
Among the given options, Marina Beach is located in Chennai. This is supported by the fact that Marina Beach stretches along the Bay of Bengal in Chennai, making it one of the city's most iconic landmarks.
Therefore, the correct answer is Option 3: Chennai.