Dalkey Hill is the northernmost of the two hills which form the southern boundary of Dublin Bay

Dublin Bay

Dublin Bay is a C-shaped inlet of the Irish Sea on the east coast of Ireland. The bay is about 10 kilometres wide along its north-south base, and 7 km in length to its apex at the centre of the city of Dublin; stretching from Howth Head in the north to Dalkey Point in the south...

 (the other being Killiney Hill

Killiney Hill

Killiney Hill is the southernmost of the two hills which form the southern boundary of Dublin Bay . Crowned by an obelisk, the hill is 153 metres high and offers beautiful views over the surrounding areas : Dublin to the northwest; the Irish Sea and the mountains of Wales to the east and...

). Dalkey Hill is 140 metres high and offers beautiful views over the surrounding areas : Dublin to the northwest; the Irish Sea

Irish Sea

The Irish Sea separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Atlantic Ocean in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man...

 and the mountains of Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 (on a clear day) to the east and southeast; and Bray Head

Bray Head

Bray Head is a hill and headland located in northern County Wicklow, Ireland, between the towns of Bray and Greystones. It forms part of the Wicklow Mountains and is a popular spot with hillwalkers. At the top of the head is a concrete cross which was placed there in 1950 during the holy year...

 and the Wicklow Mountains

Wicklow Mountains

The Wicklow Mountains form the largest continuous upland area in Ireland. They occupy the whole centre of County Wicklow and stretch outside its borders into Counties Carlow, Wexford and Dublin. Where the mountains extend into County Dublin, they are known locally as the Dublin Mountains...

 to the south.

Dalkey Hill and Killiney Hill are both part of Killiney Hill Park, a small public park overlooking the villages of Dalkey

Dalkey

Dalkey is suburb of Dublin and seaside resort in Dun Laoghaire-Rathdown County, Ireland. It was founded as a Viking settlement and became an important port during the Middle Ages. According to John Clyn, it was one of the ports through which the plague entered Ireland in the mid-14th century...

 to the north and Killiney

Killiney

Killiney is a suburb of Dublin in south County Dublin, Ireland. It is within the administrative area of Dún Laoghaire-Rathdown County. The area is by the coast, south of neighbouring Dalkey, and north to Shankill area in the most southern outskirt of Dublin....

 to the west. The park is crossed by various walking tracks, and with its spectacular views from all directions, is a popular destination for walkers and hikers from the surrounding areas.

Extensive quarry

Quarry

A quarry is a type of open-pit mine from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone, construction aggregate, riprap, sand, and gravel. They are often collocated with concrete and asphalt plants due to the requirement...

ing of Dalkey Hill in the 19th century has resulted in the existence of Dalkey Quarry

Dalkey Quarry

Dalkey Quarry is a disused granite quarry located in the Dublin suburb of Dalkey. It was used for quarrying during the 19th century, and is now part of Killiney Hill Park, a public park...

, which is now a popular rock-climbing location of national importance.