Copyright and middle-earth geography

From Wikipedia:

The Tolkien Estate maintains the position that the geographical layout of Middle-earth or any other places in the imaginary universe created by J.R.R. Tolkien was the intellectual property of J.R.R. Tolkien and subsequently is that of his heirs. The Tolkien Estate has therefore restricted the publishing of maps to those authorized by the Estate and legally pursues anyone who publishes any maps, including self-made works, on the internet.