Together with the Rione Monti, Rione Aia Piccola is the most populated area of trulli in the world. It is located in the heart of the old centre of Alberobello, which has been a UNESCO heritage site since 1996.

The name comes from the word "pipe", because on the lower course the riverbed resembles a pipe. The area of the river is a natural link between the National Park "Skadar Lake" (lower part) and the National Park "Prokletije" (source part). Its basin occupies 130 km² in the geographical area between the Prokletije Mountain massif and the Zeta plain.

Altilia is an archeological area that costituted the ancient Roman city of Sepino which originated from the intersection of two important roads: the tratturo Pescasseroli-Candela and the road connecting the Matese to the coast. The area occupies an area of 12 hectares with sqaure plan, surrounded by reticulated wall.