SS Ultonia was a British passenger-cargo vessel built in 1898 in Wallsend-on-Tyne by C. S. Swan & Hunter.

This area is now called the Ultonia Ledge, located a mile and a half southeast of Boston Light, and is as shallow as 21 feet (6.4 m) at mean lower low water according to modern nautical charts.

This event spurred the alteration of ships' courses in the area to avoid the ledge, the dredging of Nantasket Roads to a depth of 35 feet (11 m) to be safe for large steamships, and also the later dredging of the wider northern approach via President Roads, which is the now the main channel for large ships entering or exiting Boston Harbor.

[2] On 27 March 1917, Ultonia collided with the British collier SS Don Benito in the Atlantic Ocean (49°35′N 6°44′W / 49.583°N 6.733°W / 49.583; -6.733).

[3] During World War I, Ultonia was torpedoed and sunk in the Atlantic Ocean 190 miles from Fastnet, Ireland, on 27 June 1917 by the Imperial German Navy submarine SM U-53 under Captain Hans Rose.