SIMNAN, or Semnan, a small province of Persia, which, including the city and district of Damghan, is generally known as "Samnan va Damghan." It is bounded on the W. by the districts of Khar (the ancient Choara) and Firuzkuh, on the N. by Mazandaran, and on the E. by Shahrud and Bostam. In the S. it extends beyond the oasis of Jendek in the desert N. of Yezd. Its northern part is still known as Komush or Komish, the ancient Commisene. The revenue amounts to about X7000 per annum.