Sri Lanka – Wikipedia

In antiquity, Sri Lanka was known to travellers by a variety of names. According to the Mahavamsa, the legendary Prince Vijaya named the land Tambapanni (“copper-red hands” or “copper-red earth”), because his followers’ hands were reddened by the red soil of the area. In Hindu mythology, such as the Ramayana, the island was referred to as Lankā (“Island”).

: https://en.m.wikipedia.org/wiki/Sri_Lanka