More specifically, what are the most historically entrenched westernmost and easternmost Indo-European languages? For my purposes, this excludes the spread of English, Spanish etc. through relatively modern colonization efforts.
If the context helps, it's for part of a talk I'm planning on doing where I want to give a sense of scale of how exactly large the Indo-European language family is.
My initial guess would be Icelandic or Danish in the West (depending on how long ago lasting Norse settlement began in earnest in Greenland) and possibly Assamese or Bengali in the East.
Is this approximately correct?