Thesmar was a city in the South March of the Republic of Siddarmark.

It was connected to Cheryk by the Thesmar-Cheryk High Road. In the Year of God 896, the Royal Dohlaran Army marched toward the city to conquer it as part of the invasion of Siddarmark, but the Imperial Charisian Army ambushed them on the way and defeated them in the Battle of Thesmar. The Charisians then secured Thesmar, where they were given a hero's welcome. (MTAT)