Kalu (, also romanized Kaloo) is a mountain in the Takht-e Suleyman Massif of the central Alborz, in Mazandaran Province, Iran. One of the Iranian four-thousanders, it rises to about with a topographic prominence of about . The peak is also recorded under the name Kalahoo (کالاهو) in some geographic databases. The massif's highest summit is Alam-Kuh (), a major centre of Iranian mountaineering. See also List of Iranian four-thousanders
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