Mount Thullier, also known as Mount Thuillier, is a mountain on Great Nicobar Island, located in the Indian Ocean and bordering on the Andaman Sea.

The mountain is composed of parallel ridges of folded turbidite sandstone.

[1] The island's five perennial rivers – the Galathea, Jubilee, Amrit Kaur, Dak Aniang, and Dak Tayal – all originate from Mount Thullier.

[1] The hill is thought to have arisen due to tectonic activity in the region.

This Andaman and Nicobar Islands location article is a stub.