Preparis is an island located between the Bay of Bengal and the Andaman Sea, 77 km to the NNE of the Coco Islands and 133 km to the SSW from Cape Negrais, the nearest point in the coast of Burma. The island makes up the northern end of the Andaman Islands chain.
The island is 7 km long and has a maximum width of 1.8 km. It is covered with dense forest and has gentle slopes rising to a maximum height of 81 m.
According to 19th century visitors, the island was uninhabited by humans, but many monkeys were observed. The island was covered with low trees and bush, but also had narrow sandy beaches. 
The island was host to the 78th Highlanders regiment when their transport ship Frances Charlotte hit an off-shore rock in 1817. Most crew survived as a freshwater supply was discovered and their stay remained short. 
- Prostar Sailing Directions 2005 India & Bay of Bengal Enroute By National Geospatial-intelligence Agency
- Crawfurd, John, Journal of an Embassy from the Governor-General of India to the Courts of Siam and Cochin China, 1830
- The 78th Highlanders or Ross-Shire Buffs
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