Final Fantasy 16's second DLC, The Rising Tide, adds a whole new region to its map – but in terms of size, that could mean many different things. Although it has a pretty sizable world map, FF16 is not an open-world game. Each region varies in size, and is connected to the next one only in limited, specified areas, and players can't travel to most of them until they unlock new areas through the story. Despite this linearity, most map regions open up completely as soon as they're unlocked, providing plenty of opportunity for exploration.

https://screenrant.com/ff16-rising-tide-dlc-map-size-mysidia-region/