Corner Brook is a city located on the west coast of the island of Newfoundland in the province of Newfoundland and Labrador, Canada. Corner Brook is the fifth largest settlement in Newfoundland and Labrador, and the largest outside the Avalon Peninsula. Located on the Bay of Islands at the mouth of the Humber River, the city is the second-largest population centre in the province behind St. John's, and smallest of three cities behind St. John's and Mount Pearl.