Where is Baramos in Dragon Quest IX?

If you DON'T have the map, head to the island north of Swinedimples and go inside the cave. There should be a skeleton inside.

If you do have the map, consult an online guide - the grotto itself is in a different location for every player, so you'll need to look at the 17 maps on the related link until you see the location that your specific Baramos map is showing.