Further south is the seaport of Hartlepool, jutting out into the sea, a short distance from the river Tees.  It was once a place of great strength, and contained one of the most ancient monasteries in the kingdom.  A portion of the walls which defended the old haven still remains; and the new harbour has been formed by a pier run out from the south side of the town.  It will not, however, hold vessels of large tonnage.  The inhabitants are mostly engaged in fishing.