Hello, guys. I'm here to suggest my home city. Our map is not so interesting (imo), but in my vision it'd be great variant for smth like tutorial city.
I'd like to introduce to you Minsk - 2-million city in Belarus, Eastern Europe.
Here's a map of city with rivers (well, really there's just one big river, it goes from north-west to south-east. The most part of water at the south and east of city are locked into pipes. Red points with unreadable for most of you cyrillic names (sure, names doesn't matter here, but I could translate them if necessary).
Okay, many people (red points are just living places, river from nw to se, big water at the south and south-east, distant districts (see far north-east, south-east, far north, north-east, south). And also we have an airport to the east from city (15 km).
Map below is projected by city authorities map of Minsk Metro by 2030. Thickness of the line depends on its crowdness. According to map, you may see that we have overcrowded center of city. (Note from me: I can't say this map is true right now: ending stations are very popular on each line, idk why are they thinking that way)
And now, why I think this may be tutorial city: because of our metro system as it stands for 2018. Map is below: next post, please