Pitt Lake is the second-largest lake in the Lower Mainland of British Columbia, being about 53.5 square kilometres in area. It is about 25 km long and about 4.5 km wide at its widest, and is also one of the world's largest tidal lakes, its confluence with the Fraser being only a few miles upstream from that river's estuary into the Strait of Georgia. Its southern tip, where the Pitt River resumes, is 40 km east of Downtown Vancouver.