It's difficult to give a definitive list of 15 countries that are *only* close to the edge of tectonic plates, as many countries have complex relationships with plate boundaries. Additionally, the precise location of a plate boundary isn't always a clear-cut line. However, I can offer you a list of 15 countries that are *significantly impacted* by tectonic plate activity, meaning they are either directly on or very near a plate boundary:

North America:

* Mexico: Situated along the Pacific Ring of Fire, with frequent earthquakes and volcanic activity.

* United States: The west coast is on the edge of the North American and Pacific plates, leading to earthquakes (like California) and volcanic activity (like the Cascades).

* Canada: The western edge of Canada is also impacted by the Pacific plate interaction.

South America:

* Chile: Located along the Pacific Ring of Fire, with intense seismic and volcanic activity.

* Peru: Also along the Pacific Ring of Fire, known for its earthquakes and active volcanoes.

* Ecuador: The Andes mountain range, formed by the Nazca and South American plates colliding, runs through Ecuador.

* Colombia: Shares the Andes mountain range with Ecuador and experiences seismic activity.

Asia:

* Japan: Sits at the convergence of four tectonic plates, leading to frequent earthquakes, volcanic activity, and tsunamis.

* Indonesia: Located on the "Ring of Fire," experiencing frequent earthquakes and volcanic eruptions.

* Philippines: Also on the Ring of Fire, known for its active volcanoes and frequent earthquakes.

* India: The Himalayan mountains are formed by the collision of the Indian and Eurasian plates, leading to earthquakes.

* China: A large country with significant portions along the edge of the Eurasian plate, experiencing earthquakes, especially in the west.

Europe:

* Italy: Located on the boundary of the African and Eurasian plates, prone to earthquakes and volcanic activity.

* Greece: Another area impacted by the collision of the African and Eurasian plates, experiencing earthquakes and volcanic activity.

Africa:

* Ethiopia: The African Rift Valley, a zone of divergent plate movement, is found here.

Oceania:

* New Zealand: Located on the boundary of the Pacific and Australian plates, experiencing earthquakes and volcanic activity.

This list provides a good starting point for understanding the countries with a high level of tectonic activity due to their proximity to plate boundaries. Remember that the location of these boundaries is dynamic and constantly changing, so this list is not exhaustive.