Dibang Multipurpose Project is located in Arunachal Pradesh.

Explanation:
The Dibang Multipurpose Project is a hydroelectric project that is being constructed on the Dibang River in the state of Arunachal Pradesh, India. It is one of the largest hydroelectric projects in the country and is being developed by the National Hydroelectric Power Corporation (NHPC).

Here are some key points about the project:

1. Location:
- The project is situated in the Lower Dibang Valley district of Arunachal Pradesh.
- It is located in the northeastern part of India, bordering China.

2. Purpose:
- The main purpose of the Dibang Multipurpose Project is to generate hydroelectric power.
- It will have an installed capacity of around 2,880 megawatts (MW).
- The project will contribute significantly to the national power grid and help meet the growing demand for electricity in the region.

3. Environmental Impact:
- The project will have a significant impact on the environment and the local ecology.
- The reservoir created by the dam will submerge a large area of land, leading to the displacement of local communities and loss of biodiversity.
- The project authorities have undertaken various measures to mitigate the environmental impact, including conducting environmental impact assessments and implementing biodiversity conservation plans.

4. Benefits:
- The Dibang Multipurpose Project is expected to bring several benefits to the region.
- It will provide employment opportunities during the construction phase and contribute to the economic development of the area.
- The project will also help in reducing greenhouse gas emissions by generating clean and renewable energy.

In conclusion, the Dibang Multipurpose Project is located in the state of Arunachal Pradesh. It is a significant hydroelectric project that aims to generate power and contribute to the development of the region. However, it also has environmental and social implications that need to be carefully addressed.