Where is gravin threndor?

Gravin Threndor is a fictional location from the "Dungeons & Dragons" universe, specifically associated with the campaign setting of "Eberron." It is known for its rich history and the presence of various magical and political intrigues. If you're looking for specific details about its geography or lore, it would be best to consult the official D&D sourcebooks or materials related to Eberron.