Mount Thullier

{{short description|Mount in the Nicobar Islands}}

{{Use dmy dates|date=July 2019}}

{{Infobox mountain

| name = Mount Thullier

| other_name = Mount Thuillier

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| map = India Andaman and Nicobar Islands

| map_caption = Location of Mount Thullier in the Andaman and Nicobar Islands

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| elevation_m = 642

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| coordinates = {{coord|7|09|04|N|93|49|35|E|source:kolossus-frwiki|display=inline}}

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| location = Great Nicobar Island, Nicobar Islands

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| country = India

| state_type = Union territory

| state = Andaman and Nicobar Islands

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| district_type = District

| district = Nicobar district

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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. At {{convert|642|m|abbr=on}} above sea level, it is the highest point on the island and in the Nicobar Islands.

The mountain is composed of parallel ridges of folded turbidite sandstone.P. C. Bandopadhyay and A. Carter. "Chapter 2: Introduction to the geography and geomorphology of the Andaman–Nicobar Islands". Geological Society, London, Memoirs, 47, 9-18, 2 February 2017, https://doi.org/10.1144/M47.2. [https://mem.lyellcollection.org/content/47/1/9]

The island's five perennial rivers – the Galathea, Jubilee, Amrit Kaur, Dak Aniang, and Dak Tayal – all originate from Mount Thullier. The Galathea River is the longest, flowing southwards for about 30 km to empty into the sea at Galathea Bay near the southern tip of the island.

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