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The Westrift is a fjord between Coldarra Island from the Borean Tundra of Northrend.

Just above the Borean Tundra region’s southwest tip is Westrift, a tremendous tear in the ice that stretches for miles. It separates the Borean Tundra from Coldarra, and the only place to cross is a lone bridge near the center.^{LoM 93}

It is called 'Westrift Valley' on the official WotLK site.

Subzones of Borean Tundra
Coldarra • Fizzcrank Airstrip • Frostbridge • Justice Keep • Kaskala • The Nexus • Riplash Ruins • Temple of En'kilah • Warsong Hold • Westrift