While it's true that North America is moving west over the hotspot, creating the Yellowstone Plateau, the park itself isn't situated on a traditional plate boundary like a divergent, convergent, or transform boundary. Instead, it's located over a plume of superheated magma rising from deep within the Earth's mantle. This plume creates a large volcanic system, responsible for the geysers, hot springs, and other geothermal features Yellowstone is famous for.