Introduction:
The Guwahati High Court is one of the oldest High Courts in India and has territorial jurisdiction over several states in the northeastern region of the country. It was established on 1 March 1948 and has its principal seat in Guwahati, Assam. The High Court has jurisdiction over both civil and criminal matters and serves as the apex judicial body for the states under its purview.

States under the Jurisdiction of Guwahati High Court:
The Guwahati High Court has territorial jurisdiction over the following states:

1. Assam:
- Assam is the home state of the Guwahati High Court and its principal seat is located in Guwahati, the largest city in Assam.
- The High Court handles a wide range of cases from the state, including civil, criminal, and constitutional matters.

2. Arunachal Pradesh:
- Arunachal Pradesh is a neighboring state of Assam and falls under the territorial jurisdiction of the Guwahati High Court.
- The High Court is responsible for adjudicating legal matters and providing justice to the people of Arunachal Pradesh.

3. Nagaland:
- Nagaland is another state that comes under the jurisdiction of the Guwahati High Court.
- The High Court has the authority to hear and decide cases related to civil, criminal, and constitutional matters from Nagaland.

4. Meghalaya:
- Meghalaya, a state known for its scenic beauty, is also under the territorial jurisdiction of the Guwahati High Court.
- The High Court caters to the legal needs of the people of Meghalaya and ensures that justice is served.

5. Mizoram:
- Mizoram is yet another state under the jurisdiction of the Guwahati High Court.
- The High Court handles legal matters and provides a platform for resolving disputes for the people of Mizoram.

6. Manipur:
- Manipur, a state famous for its rich cultural heritage, also falls within the territorial jurisdiction of the Guwahati High Court.
- The High Court plays a crucial role in resolving legal disputes and upholding justice in Manipur.

7. Tripura:
- Tripura, a state located in the northeastern part of India, is also under the jurisdiction of the Guwahati High Court.
- The High Court serves as the apex judicial authority for Tripura and ensures the proper functioning of the legal system in the state.

Conclusion:
The Guwahati High Court has territorial jurisdiction over a total of seven states in the northeastern region of India. These states include Assam, Arunachal Pradesh, Nagaland, Meghalaya, Mizoram, Manipur, and Tripura. The High Court is responsible for adjudicating legal matters, providing justice, and upholding the rule of law in these states.