Difficult site to describe without a plan so I have posted a sketch plan.
All rows run NE/SW and have cairns at their NE ends (uphill) and longstones at their SW ends.
Row 1 is 150m long and ends in a 3.0m high longstone – its broad face in line with the row. The SW half of the row is a single row which then becomes double for 47m then single again.
The Row 2 longstone is 4.2m high (the tallest standing stone on Dartmoor). Its broad face cuts across the line of the row. The row is 83m long – single with several large gaps.
Row 3 (like Row 1) is 150m long but is single throughout. Its longstone is 2.3m high.
The Giant’s Basin cairn (22m diameter by 4m high) sits to the SE of the Row 1 cairn.
There are several other cairns at the site not marked on the plan.