Chambered long barrows are a type of megalithic burial monument found in the British Isles

British Isles

The British Isles are a group of islands off the northwest coast of continental Europe that include the islands of Great Britain and Ireland and over six thousand smaller isles. There are two sovereign states located on the islands: the United Kingdom of Great Britain and Northern Ireland and...

 in the Neolithic

Neolithic

The Neolithic Age, Era, or Period, or New Stone Age, was a period in the development of human technology, beginning about 9500 BC in some parts of the Middle East, and later in other parts of the world. It is traditionally considered as the last part of the Stone Age...

.

Long barrow

Long barrow

A long barrow is a prehistoric monument dating to the early Neolithic period. They are rectangular or trapezoidal tumuli or earth mounds traditionally interpreted as collective tombs...

s either contained wooden or stone burial structures beneath the barrow

Tumulus

A tumulus is a mound of earth and stones raised over a grave or graves. Tumuli are also known as barrows, burial mounds, Hügelgrab or kurgans, and can be found throughout much of the world. A tumulus composed largely or entirely of stones is usually referred to as a cairn...

 and the surviving megalithic stone in the latter means that they are the ones referred to by archaeologists as chambered. This distinction may have been more to do with the availability of local materials however than any cultural differences.

They are concentrated in southern Britain and parts of northern England.

Chambered long barrow sub-types include:

• Severn-Cotswold tomb
  Severn-Cotswold tomb
  Severn-Cotswold is a name given to a type of Megalithic chamber tomb built by Neolithic peoples in Wales and South West England around 3500 BC.-Description:...
  
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• Certain Passage grave
  Passage grave
  thumb|250px|right|A simple passage tomb in [[Carrowmore]] near [[Sligo]] in IrelandA passage grave or passage tomb consists of a narrow passage made of large stones and one or multiple burial chambers covered in earth or stone. Megaliths are usually used in the construction of passage tombs, which...
  
  s
• The Medway tombs