dv said:

Do naval vessels often dock in Paris? I would think a proper sized ship would have difficulty reaching it.

No large ships can be accommodated in Paris.

The ‘port’ of Paris is served exclusively by small river cruise ships and barges, which are purpose-built to navigate the Seine’s shallow draft and 37 bridges.

Ships which list ‘Paris’ on their itinerary actually call at Rouen or Le Havre, about 200 km away.