Tohvun III is a pleasant, if somewhat cold and damp (by Cardassian standards), planet on the Federation frontier. It is mainly an outpost for traders and tourists interested in trekking the forested sloped of Mandara, an enormous inactive volcano.
The Cardassian embassy on Tohvun III was the site for peace talks in the Federation-Cardassian War. The talks, however, were scuppered by the efforts of Obsidian Order operatives Maladek, Oonal and Elim Garak. (DS9 novel: A Stitch in Time)