The line on the right approaches Port aux Basques, Newfoundland, and the other line approaches the mouth of the Grand Codroy River. Those two points are roughly 34 kms (~20 miles) apart. This image was captured in 1989 aboard the Space Shuttle Columbia (STS-28) from an altitude of approximately 175 miles.

The crew of STS-28 were: Brewster H. Shaw, Jr., Commander, Richard N. Richards, James C. Adamson, David C. Leestma, and Mark N. Brown.

You will find more information about STS-28 at this link: STS-28 - Columbia