Hewitts are hills in England, Wales and Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 that are at least 2000 feet (609.6 m) high with a relative height of at least 30 m. The original list, covering only England and Wales, was compiled by Alan Dawson and originally published in The Relative Hills of Britain under the name Sweats. The list was subsequently renamed Hewitts to include Ireland, updated, and published in a series of three booklets edited by Dave Hewitt: The Hewitts and Marilyns of Wales, The Hewitts and Marilyns of England and The Hewitts and Marilyns of Ireland.

There are 211 Hewitts in Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

, 19 of which lie in Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

:

Region 43 (Armagh, Down, Antrim)

• Slieve Donard
  Slieve Donard
  Slieve Donard is a 850 m mountain in County Down, Northern Ireland. It is part of the Mourne Mountains and the highest peak in Northern Ireland and in the wider province of Ulster. It is the 19th highest peak on the island of Ireland...
  
   - 850m
• Chimney Rock Mountain - 656m
• Slieve Commedagh
  Slieve Commedagh
  Slieve Commedagh is a 767 m mountain in County Down, Northern Ireland. It is the second-highest of the Mourne Mountains, after Slieve Donard, and the second-highest mountain in Northern Ireland....
  
   - 767m
• Slieve Binnian
  Slieve Binnian
  Slieve Binnian is the third highest mountain in Northern Ireland at . The name comes from the rocky tors situated around the top of the mountain. These very rugged crest of rocky tors makes it easy to identify in views around the Mourne Mountains....
  
   - 747m
• Slieve Binnian North Top - 678m
• Slieve Bearnagh
  Slieve Bearnagh
  Slieve Bearnagh is a mountain in the Mourne Mountains, Northern Ireland. Its summit is crowned by a number of rocky tors. The Mourne Wall crosses the summit of Slieve Bearnagh east to west. Paths lead to the cols on either side of the mountain, namely Pollaphuca to the west and Hare's Gap to the...
  
   - 739m
• Slieve Meelbeg - 708m
• Slieve Meelmore - 704m
• Slieve Loughshannagh - 620m
• Slievelamagan - 704m
• Cove Mountain - 655m
• Slieve Muck
  Slieve Muck
  Slieve Muck is one of the Mourne Mountains in County Down, Northern Ireland. It has a height of 674 metres . Its summit overlooks Spelga Dam and the Deer's Meadow, the source of the River Bann....
  
   - 673m
• Eagle Mountain - 638m
• Shanlieve - 627m

Region 44 (Derry, Tyrone, Fermanagh)

• Sawel Mountain
  Sawel Mountain
  Sawel Mountain, historically Slieve Sawel , is a mountain in County Londonderry and County Tyrone, Northern Ireland. It is the highest peak in the Sperrin Mountains, and the seventh highest in Northern Ireland. To the north of Sawel is County Londonderry, and to the south, County Tyrone. The summit...
  
   - 678m
• Dart Mountain - 619m
• Mullaghclogha - 635m
• Mullaghaneany - 627m
• Meenard Mountain - 625m

One further Hewitt lies on the border, and is the highest point of two counties Cavan

Cavan

Cavan is the county town of County Cavan in the Republic of Ireland. The town lies in the north central part of Ireland, near the border with Northern Ireland...

 and Fermanagh and of the border itself:

Region 45 (Donegal to Sligo)

• Cuilcagh
  Cuilcagh
  Cuilcagh, historically Slieve Cuilcagh , is the highest mountain in the Breifne area and the 165th highest on the island of Ireland . The summit lies on the border between County Fermanagh and County Cavan , and is the highest point in both counties...
  
  - 665m