Unless I am mistaken it´s bad English, I would partially edit the text into something more readable. But here you go anyway, here is my stab at it.
What settlements there are line the banks of the River Nebra, a vibrant blue vein running through the heart of the sands.
Em quantos povoados há linhas de defesa (line - certainly defense lines) do Rio Nebra, uma vibrante veia azul que corre pelo coração das areias do deserto...
What - could be "quanto", mostly in interrogative form, but it´s game, so who knows? So, perhaps it was used in an statement.