The Mae Ramphan (, )Official maps used Mae Ramphan as seen on a report of Sukhothai Provincial Rural Road Division or Mae Lamphan (, also transliterated as Mae Lampan) is a river and canal in the provinces of Lampang and Sukhothai in Thailand. It is a tributary of the Yom River, part of the Chao Phraya River basin.
It originates in Thoen District, Lampang Province. It flows through the border with Ban Tak District in Tak Province into Ban Dan Lan Hoi District in Sukhothai Province, and to Mueang Sukhothai District as it passes through the Sukhothai Historical Park. The watercourse joins the Yom River in Mueang Sukhothai District, to the north of temple.
Archaeological survey in the basin has recorded more than thirty sites, with settlement going back over 3,000 years. In the headwaters are ancient mines and more than a hundred iron-smelting furnaces, the nearest metal-producing ground to the old city of Sukhothai, about 20 km away. Excavation beside the Kong Khai, a tributary in Ban Dan Lan Hoi district, dated smelting there between 1128 and 1280 by thermoluminescence and radiocarbon. Theerasak Thanusilp proposes that the bronze casting of Sukhothai drew on the metallurgical knowledge of these communities, noting that no finished object has yet been found at a production site.
The watercourse plays a role in agriculture, especially in the middle section in Ban Dan Lan Hoi. Towards the end of the course, it passes and intersects with various historical courses of Sukhothai Kingdom, including and ancient irrigation canals. It is believed to have been a significant canal during the Sukhothai era. Chusak Satienpattanodom likewise treats Thanon Phra Ruang as a canal rather than a road, following Thiwa Suphachanya, and puts its length at about 123 km from Kamphaeng Phet through Sukhothai to Si Satchanalai. He records that the question is not settled. He places two earth dams west of Si Satchanalai, 750 m and 1,065 m long, in the same system of works. His wider argument is that the medieval landscape was wetter than the present one and that the water table has since fallen.
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