The Raptor Slate is one part of a four part stone slate in Resident Evil 5.
It can be found by moving to the east dock of the map of the Marshlands. Once docked it can be found inside a chest in one of the buildings seen ahead. The buildings, however, are surrounded by deep water which is infested with crocodiles. Once above the water several Wetlands Majini will attack. After they are defeated, retrieve the slate. It is used to open the door to the Ndipaya village.