"In the Dutch mountains" is not a real place name. It's actually the title of a song by the Dutch rock band The Nits. It was released on their 1987 album "Countdown" and became a major hit in Europe, especially in the Netherlands.
So, "in the Dutch mountains" doesn't refer to an actual mountain range but rather the song title and potentially its lyrics or themes. Is there anything specific about the song you'd like to know? Perhaps the meaning, the story behind it, or its cultural impact in the Netherlands?