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Proximity to a river meant water and fish (if any), also the game that wandered there for sustenance provided meat. But, it also meant recurring floods.
Landlocked cities were easier to plan and expand, but were susceptible to attacks. Also the distance from the water sources could leave the city battling a drought during summers.
Cities on mountains meant inaccessibility, so they were better protected. But supplies had to be gathered from neighboring forests, thus a critical threat of the wild bests loomed over the citizens.
Most cities of myth that were lost with treasures were tucked away in a cosy spot amidst the mountains, or surrounded by water on all sides.