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Silk Road

It is similar to the trade route of CK2. trade route give bonus to tax. trade route has trade value. and trade post affect trade value. occupation and raid will decrease trade value for a while... that sort of things.
You can disable the Trans-Saharan in game rules.

Dunhuang Caves, Potala Palace, Ellora Caves, Ajanta Caves, Sanchi Stupa, Osun-Osogbo Sacred Grove, Turpan's Karez, Sigiriya, Temple of Bel

My dynasty, Special building slot, Trade routes, Holy Order, Season(winter)

This mod modify "gui/shared/mapmode.gui", "gfx/map/map_modes/map_modes.txt"
If you use any other mod that modify these files, you can't use additional map modes.