The seven Union Territories of India and their adjacent countries are as follows:

1. Andaman and Nicobar Islands - located in the Bay of Bengal and adjacent to Myanmar and Thailand.
2. Lakshadweep - located in the Arabian Sea and adjacent to Maldives.
3. Dadra and Nagar Haveli and Daman and Diu - located in western India and adjacent to Gujarat.
4. Chandigarh - located in northern India and adjacent to Punjab and Haryana.
5. Puducherry - located in southern India and adjacent to Tamil Nadu.
6. Delhi - located in northern India and adjacent to Haryana and Uttar Pradesh.
7. Jammu and Kashmir - located in northern India and adjacent to Pakistan, China, and Afghanistan.

Explanation:

Andaman and Nicobar Islands are a group of islands located in the Bay of Bengal. They are adjacent to Myanmar and Thailand. Lakshadweep is a group of islands located in the Arabian Sea. They are adjacent to the Maldives. Dadra and Nagar Haveli and Daman and Diu are two separate territories that were merged into one in 2020. They are located in western India and are adjacent to Gujarat.

Chandigarh is a union territory that serves as the capital of two states, Punjab and Haryana. It is located in northern India and is adjacent to both states. Puducherry is a union territory located in southern India. It is adjacent to the state of Tamil Nadu.

Delhi is a union territory that serves as the capital of India. It is located in northern India and is adjacent to the states of Haryana and Uttar Pradesh. Jammu and Kashmir is a union territory located in northern India. It is adjacent to Pakistan, China, and Afghanistan.

In conclusion, India has seven union territories, each with its unique characteristics and adjacent countries/states.