I've been digging through the files a bit and based on what I found in Sid Meier's Civilization VI/Base/Assets/Gameplay/Data/Civilizations.xml, the starting biases are:
Brazil: Jungle
Egypt: Flood Plains (and rivers in general)
England: Coast
France: River
Greece: Hills (of any type: Grass/Plains/Tundra/Desert)
Kongo: Jungle or Forest
Norway: Coast and Forest
Russia: Tundra (and Tundra hills)
Scythia: Grassland/Plains with Horses (yes, they actually have a Horse bias)
Spain: Coast
Sumeria: River
Each of these also has a number associated with it, indicating their "tier", varying from 1 to 5. I believe lower number means higher priority, but I'm not sure if that is in comparison to other civs with that bias or just your own. I decided to leave them out to make the list easier to read but I can add them if you want.