Pontikokastro (Greek: Ποντικόκαστρο), known in French as Beauvoir and Italian as Belveder during the late Middle Ages, is a Byzantine castle in Agios Andreas, Katakolo, in the Peloponnese peninsula of Greece.

It is located in the northern part of Ichthys Bay, 100 meters from the coast, and is built on the ruins of the acropolis of ancient Pheia, dating from 700 BC.

The most probable view is considered to be that of the folklorist Dinos Psychogios, that the name came from a corruption of the Latin "fonticum", meaning warehouse, because the castle was used as storage for crop wheat and other products.

[5] During Ferdinand of Majorca's attempt to seize the Principality in 1315–16, Beauvoir was captured and held by his forces until after his defeat and death in the Battle of Manolada.

In the middle of the castle there is an oblong calculated cistern, measuring five metres (16 ft) from north to south, divided into two unequal parts by a partition wall, and four pairs of square holes from which the water came out sideways.