Sirmach (, also Romanized as Sīrmach, Sīramoh, and Siramch; also known as Rāpch and Sīrāmach) is a village in Gabrik Rural District, in the Central District of Jask County, Hormozgan Province, Iran. At the 2006 census, its population was 282, in 57 families.

The village is located near a tidal inlet known as Khowr Rapch or Lahūr-e Rāpch, a large and shallow inlet with a maximum depth of 8m,Red Sea and the Persian Gulf (ProStar Publications, 2007) page 208.George N. Curzon, Persia and the Persian Question. In Two Volumes. Volume 2. (Longmans, Green, and Co., London, 1892). the mouth of which is flanked by sand hills. The port of Jask, Iran is 204.7 km to the west and Chahbahar, 158.1 km to the east.

The nearby deserted village of Galak Traveling Luck for Gālak, Sīstān va Balūchestān, Iran. has been identified by someEdward Thomas, The Royal Asiatic Society (Oxford University, 1879) page 148 as the ancient Hellenistic port of Rhogana.

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