Ythan Wells, also known as Glenmailen, is the site of a Roman military camp, near the farm of Glenmellan, 2.1 kilometres (1.3 mi) east of the village of Ythanwells in Aberdeenshire, Scotland. The site is a designated scheduled monument. The site is situated at the headwaters of the River Ythan, where a series of natural springs supplies potable water, that was convenient for the large marching camp installed here by the Romans in the first few centuries AD.