It's "From the Ducies to the Swin"

Possibly Ducie Island, Pitcairn, probably the most southern but of the empire. 3rd Baron Ducie was a British politician and naval officer. The poem was published in 1896 at the time of a dispute over it with the USA so it may have been 'in the news'. But why Ducies - plural?

Robert Ducie, Mayor of London in the 17th century, and Thames Conservator, wrote regulations covering the Thames estuary, Medway, and downstream. So Ducies may refer to some part of the tidal upper Thames, at the other end from the Swins.