Bhitarkanika National Park is situated in the state of Odisha.

Introduction:
Bhitarkanika National Park is a prominent wildlife sanctuary located in the Indian state of Odisha. It is renowned for its rich biodiversity and is considered one of the most significant ecosystems in the country. Let's explore the reasons why the correct answer to the question is Odisha.

Location:
The Bhitarkanika National Park is situated in the northeastern region of the state of Odisha. It is spread across the Kendrapara and Bhadrak districts and covers an area of approximately 672 square kilometers.

Biodiversity:
1. Flora: The national park encompasses diverse vegetation consisting of mangrove forests, saltwater mixed forests, and tidal swamp forests. These mangroves provide a unique habitat for various species of plants and help maintain the ecological balance of the region.
2. Fauna: Bhitarkanika National Park is home to a wide range of wildlife species. It is particularly famous for its population of saltwater crocodiles, which is one of the largest in India. Other wildlife species found here include Indian python, king cobra, monitor lizard, spotted deer, wild boar, and various species of birds.

Importance:
1. Conservation: Bhitarkanika National Park plays a crucial role in the conservation of various endangered species. It has been recognized as a Ramsar site, indicating its international importance for wetland conservation.
2. Crocodile Conservation: The park is well-known for its efforts in conserving saltwater crocodiles. The successful conservation initiatives have led to an increase in their population and have become a model for conservation programs across the country.
3. Ecotourism: Bhitarkanika National Park attracts a significant number of tourists due to its scenic beauty and diverse wildlife. The park offers opportunities for boating, trekking, and bird-watching, providing visitors with a unique nature experience.

Conclusion:
Bhitarkanika National Park is a significant wildlife sanctuary situated in the state of Odisha. Its unique mangrove ecosystem, diverse flora and fauna, and successful conservation efforts make it a notable destination for nature enthusiasts and researchers.