Hi there, Berastagi is in North Sumatera province (not minang. Minang is normally associated with West Sumatera region). It is possible that you can do a day travel from Medan to Berastagi. It'll take around 2 hrs drive from Medan to Berastagi. While you are travelling to North Sumatera, might as well that you also take some overnight trip to Lake Toba.
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