Cranberries are found across certain areas in New Worlds at specific regions and can be gathered by any level harvester.
Cranberries only grow in the Forest regions in each zone, this is that dark green area with tiny trees on the map.
Which territory you’re currently in will determine how many forest regions that you have available to harvest Cranberries.
Luckily, at level 20 you can track farm plants and berries making Cranberries a lot easier to find. If you are ever having troubles locating these plants just keep an eye on your compass and you’ll see any that are nearby.