Menhirs are  megalithic standing stones: they can be found as stand alone monoliths or as part of a group of similar stones. Standing stones are common in Lampedusa, however only few of them can be considered of archeological interest in my opinion. The main factors that permit to classify a standing stone in Lampedusa as a Menhir are in my opinion two:

1-The presence of ancient ceramic/pottery sherds close to the standing stone or other traces/remains of ancient lithic tools
2-The presence of traces/remains of  other stone structures/buildings next or close to the standing stones

I have located three megalithic sites in Lampedusa that satisfy all the conditions to call their standing stones as megalithic Menhirs with archaeological interest: