Absolutely. Dangerous goods are required to have a consignment and documentation, and this documentation is well known in advance. When ships arrive, any dangerous good on board the ship is known in advance. When they arrive in port, if there is a dangerous good, they're usually moved to a certain particular dangerous good area in these ports. It's similar under the IMDG code and other regulations like that.
So specifically, yes, there are dangerous goods areas, and documentation precedes the load.