The Barony of Larchos was a Corisandian patent of nobility, making its holder the ruler of an area in the centre north of Corisande Island.

The jagged Marthak Mountains formed the border between Larchros and the Earldom of Craggy Hill. Despite the fact that Safehold's equator passed directly across the northern Marthaks, there was snow on their highest peaks almost year-round, and the Barcor Mountains, in whose foothills the capital city of Serabor was located, were even taller. (AMF)