The Chukotka Mountains are one of the two main mountain regions of Chukotka. They rise west and east of the isthmus area of the Chukchi Peninsula, in the central Chukotka region, bounded by the Anadyr Highlands in the southwest. They are composed of mountains of middle height displaying alpine relief, as well as low mountains. They stretch in roughly WNW/ESE direction for , between the head of Chaun Bay and the Bering Sea shore. The ranges of the northern area consist of sandstone and shale with granite intrusions, while those of the southern part are made up of volcanic rocks. The highest peak is Mount Iskhodnaya (Исходная) in the Chantal Range. which is high —or according to other sources.