We won't do all the categories in this topic, it'd be too long, so each person gives one category for the next person, and it doesn't have to be solely a name, a country, a river, etc; eg it can be a job, a fruit, an animal, whatever, and if you feel like it you can even invent names ^_^
Example:
Person 1: A country in W
Person 2: Wagonland, where everyone travels only in wagons. A river in A.
Person 3: Arno, Italy. A job in S.
Person 4: Sarcastor, who's paid to be sarcastic all the time. Fruit in L.
etc, etc.
I'll start ^^
Flower in M