Fix grammar in this sentence: I was read about an inland valleys, a broad, shadowy, grey thing; immensely broad, immensely shadowy, winds away including immense, half-invisible mountain into the silence through an unknown countries.
I was reading about an inland valley, a broad, shadowy, grey thing; it was immensely broad, immensely shadowy, winding away between immense, half-invisible mountains, into the silence of an unknown country.