The same forms natural borders between provinces of Mazandaran and Tehran. These mountains run in a west to east direction and envelops many peaks with elevations of more than 4,000 m. The tallest of these are the summits of Alam Kooh and Takht-e-Soleiman reaching the heights of 4,850 m. and 4,643 m. respectively. Gigantic and permanent glaciers are present in its southern valleys. The most important of these mountains are: Alam Kooh Peak: This peak stands to the height of 4,850 m. From the north it joins the Shaneh Kooh Mountains, from the south it adjoins the Khersan peak and from east it connects to the Siyah Sang. To the west of its summit, is the glacier of Haft Khal and to its nothwest lies the glacier of Alam Chal, which is considered to be the largest and tallest mountainous barrier of Iran. This mountain has two branches, reaching an elevation of 4,750 m. (one to the east, known as the eastern branch of the Alam Kooh, and the other to the west, known as the western branch of the Alam Kooh). There are four colossal glaciers on four fronts of this mountain. Takhte-e-Soleiman Peak: Reaching a height of 4,643 m. joins the Siyah Gug peak to the north, and in the south adjoins the Shameh Kooh peak. Khersan Peak: The said comprises of two peaks, the northern and southern ones that adjoin, at an elevation of 4,640 m. In the north, a pass by the same name connects it to the Alam Kooh summit. To the south, it adjoins the Minareh peak and to the east, is the Khersan glacier. This peak ranks third in comparison to elevation after the summits of Damavand and Sabalan. Sialan Summit: The same is located in the south of the township of Tonekabon and its elevation being 4,250 m. The ascent to the said is from the verdant forests. From one side, the Sialan peak faces the sea, and from the other, the snow-clad mountains in the surroundings are visible. The skirts of which are furnished with red flowers and rhubarbs in spring and summer seasons.