Poldhu lies on the coast of Mount's Bay and is in the northern part of the parish of Mullion; the churchtown is 2 kilometres (1.2 mi) to the south-east.

[2] The beach at Poldhu was heavily mined during World War II to prevent any prospect of a German force landing there.

[3] In January 2016, Poldhu Cove was inundated with thousands of pink plastic bottles, brought onto the beach with successive tides.

[4] The site is famous as the location of Poldhu Wireless Station, Guglielmo Marconi's transmitter for the first transatlantic radio message on 12 December 1901.

The site has a stone monument pillar, erected in November 1937 by the Marconi Company, and a number of concrete foundations and earth structures also remain.

Sherlock Holmes and Dr. Watson are staying "together in a small cottage near Poldhu Bay" in "The Adventure of the Devil's Foot", a 1910 short story by Arthur Conan Doyle.

[11] In the first episode of the 2018 female-led adaptation Miss Sherlock, "Poldhu" is the name of a brand of wireless medical telemetry devices in the form of a capsule that is swallowed by the user, which the murderer exploits as triggers for liquid bombs that destroy the abdominal cavities of her victims.