A hill fort with a single bank and ditch lies on a headland near the coastal hamlet of Tre-Fadog, overlooking the sandy bay of Port Trefadog.

This church is dedicated to Maethlu the Confessor who is thought to have founded an early Christian religious establishment about three quarters of a mile to the south of the present building.

The operation started in 1827 and the signals were at first made using flag semaphore, meaning that they could be obstructed in adverse weather conditions.

[9] There is an electoral ward of the same name: it includes the neighbouring communities of Llanfachraeth and the southern half of Cylch-y-Garn, and has a population that totalled 1,648 at the 2011 census.

On 25 February 1898, on passage from Milford Haven to Caernarfon, it was caught in a force 8 gale and was blown ashore in Porth Tywyn-mawr.

[13] Town Of Wexford was a sailing vessel (possibly also with a steam engine) running the mail service between Holyhead and Dublin.

On 16 November 1888 it was carrying a cargo of timber from West Bay in Nova Scotia to Liverpool but became stranded on the beach south of Borthwen headland in a southwesterly force 8 gale.

The captain and another man had landed by boat, but at high water the barque was blown stem on to the rocks.

The Holyhead lifeboat was called out and Mr Williams, Chief Coastguard, was able to deploy their rocket apparatus to get a line out to the barque.

[15] The United Friends was a wooden sloop built in 1828 which was wrecked while carrying coal and maize from Liverpool to Trefadog on 22 November 1877.

An area of mire and fen known as Llyn Garreg-lwyd is designated a Site of Special Scientific Interest (SSSI), due to its wetland plants and associated breeding birds.