Add support for the "Great River" terrain from "Real Rivers for Random Maps" to the following Saph's Maps, giving fresh water to navigable rivers and selected large inland water bodies (e.g. Lake Baikal, Aral Sea, etc.):
Supported maps (which are all linked here) include:
- Africa Plus
- Africa Plus: Humid Edition
- Americas
- Atlantic: A Clash of Worlds
- Britain and Ireland / British Isles
- East Asia
- Mediterranean: Mare Nostrum
- Mediterranean: Ice Age
- Middle East: Cradle of Civilization
- Orbis Terrarum Redux
- Twin Europes
