No they are miles apart.
The White Cliffs of Dover are cliffs forming part of the English coastline. The cliffs reach up to 300 feet in height and stretch for 10 miles to the east and west of Dover.
The White Cliffs of Dover are located in Europe, specifically the country of England. Due to its location in the British Isles, the cliffs are not part of Continental Europe.
The white cliffs of Dover began eroding at the end of the last ice age, around 10,000 years ago. Before that they were part of a large system of rolling hills made of chalk.
The South of England is the wealthiest part of the UK.
About this part of Britain was submerged by a shallow sea, the sea bottom was made of a white mud formed from the fragments of coccoliths (skeletons if tiny algae), then the mud became chalk
The word cliffs is a plural noun. The singular is cliff.
Most of it is in the parish of Dover obviously but part of the north skirts of the city is in the Whitfield parish and part of the east in Temple Ewell and Kearnsley
The Straits of Dover is part of the English Channel, between The UK and France, so is salt water.
From Cork City to the Cliffs of Mother is 110 miles or 177 kilometres. From the nearest part of county Cork to the Cliffs of Moher is about 70 miles or 114 kilometres.
Straight of Dover
The Strait of Dover, in the English Channel, separates Britain from France.
Harry Potter and the Deathly Hallows isn't set in one place. You see the Durlsey's home, the Burrow, Hermione's home, Grimnauld Place, the Ministry of Magic and many forests and such. They even camp on the White Cliffs of Dover.