Where to find dragons in King's Bounty 2

In King's Bounty 2, you control a hero who, by himself, cannot fight opponents. Hired units do it for him, and among others you can get huge dragons. Here's how to do it:

• Bone dragon. There can be no more than one dragon of this type in one army unit. You will immediately receive TWO Bone Dragons after completing the side quest "Fatal Journey". The Bone Dragon's special ability is called Restoration. With its help, the creature completely heals itself.
• Two more Red Dragons will be available for completing the "Lissa's Dungeon" quest. With its WALL OF FIRE skill, the dragon moves in a straight line to any point and deals massive damage to all enemies that get in its way. It also inflicts burning on them and ignores the zone of control.