The road which runs along the east coast of south Harris is known colloquially as the "Golden Road" as it cost so much money to build, when it was built in 1897. It runs from Tarbert to Rodel through the area of Harris known as Bays and through the coastal townships.
The bedrock of Harris is largely Lewisian gneisses, which were laid down in the Precambrian period, interspersed with igneous intrusions. One of these intrusions forms the summit plateau of the mountain Roinebhal. The rock here is anorthosite, and is similar in composition to rocks found in the mountains of the Moon.
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