Mergan terrain forming

River network based approach:

1. map coastline
2. create rivers
3. determine height

Natural features

Coastline: natural=coastline
natural/coastline in MER

Rivers: waterway=river / waterway=stream / waterway=canal / type=waterway
waterway/river in MER, waterway/stream in MER, waterway/canal in MER, type/waterway in MER

• • straits
  • bays
  • wetlands

Mountains

• ridge
• valley
• peak