Permanent Lands
A permanent land does not disappear, you can travel there whenever you want and explore it at your own pace.
Permanent lands are connected to the main storyline, so you'll have to follow the correct order.
You cannot have more than 15 open permanent locations simultaneously. Settle one of the locations you explored to unlock a new one.
Once you settle a land, you can't chop objects there. So it is highly recommended that you clear all the resources from the location before turning it into a settlement.
Not all permanent locations can be settled, some of them are reserved for farming.
You can find any land you need via the Observation Tower or Aerodrome.
If you can't find the needed location on your map, it could be you need a new area map. Check out this guide for more information
Klondike Map
Click an area on the map for more information