PLISKA (Pavel Georgiev – pavel_g@gbg.bg, Radoslav Vasilev, Gergana Ilieva) A sondage was carried out in the Large Outer Earth Fortification of the Outer Town. The sondage was situated across Canal II running along the southern passage of the fortification. The canal was cut into the marl bedrock and was c. 5 m wide in its upper part and c. 1.60 m wide in its lower part. A sherd of the 9th century AD, a fragment from a terracotta pipe from water-conduit and animal bones were found inside the canal. The central part of the eastern side of the Large Outer Earth Fortification was without a ditch in a section c. 250 m long, due to the marl bedrock situated very close to the surface of the terrain. That explains why the rampart in this part of the fortification is low and it played the role of a dike, which protected the lower part in this sector of the Outer Town from the water that was collected in the ditch located to the north. During the construction of the rampart, or soon after, Canal I was dug out and it caught part of the water that was collected in front of the rampart and led it into the dry valley located nearby. The digging of Canal II resulted into the opening of a second passage into the rampart. Thus, a double entrance was constructed in this part of the fortification and a road was made.