Taftan is the highest mountain in southeast Iran. The topography is overall steep. Deep valleys with U and V shapes have developed on Taftan, and the volcano has a strongly eroded appearance. One of these valleys, Tamindan, may be the Damindan valley in the Avesta religious texts. One series of ignimbrites surrounding Taftan which reaches thicknesses of and reaches distances of from the edifice may be 2 million years old.