I don't no if I got this correct. But by northwest passage i assume you mean the waters in Canada's north. If i assume that, there is no mountain range that blocks the area. I think the ice pack that is frozen year round is blocking this. As a result of global warming however, this ice pack is melting. So in the near future maybe a northwest passage can actually open up.
The Atlas Mountain range is located in Northwest Africa.
the atlas mountain range
The Scandinavian Mountains.
The mountain range located in the northwest part of South Carolina is called the Blue Ridge Mountains.
northwest mountains of Pakistan are hindukush ranges
The Cascades.
The Atlas Mountains are the principal mountain range of northwest Africa, stretching across Morocco, Algeria, and Tunisia. These mountains are known for their rugged beauty and diverse ecosystems, including alpine forests and high plateaus.
The Hamersley Range is a mountain range in the Pilbara region of northwest Western Australia.
grampian mountains
The Pacific Northwest contains the Cascade Mountain range and is bounded to the east by the Rocky Mountains range. Out on the Olympic Peninsula near Seattle is the wild Olympic Mountain range, surrounded on three sides by the ocean. Oregon features the Pacific Coast Range, and northern Idaho is home to the Sawtooth Range, Bitterroot Range, Cabinet Range, and Selkirk Range, among the total of 80 mountain ranges in the State.
Olympic
Cascade Range is the major mountain range in the Pacific Northwest, running from northern California through Oregon and Washington up to British Columbia in Canada. It includes iconic peaks like Mount Rainier and Mount Hood.