Why would people need to cross a river if both sides only have one city?

 There are several reasons why people might need to cross a river even if both sides only have one city:

1. Trade and commerce: Even if there's only one city on each side, trade and commerce between the two cities can still occur. Goods, services, and people may need to cross the river to conduct business, transport goods, or access markets.

2. Transportation routes: Rivers have historically served as important transportation routes. Even if there's only one city on each side, there may be roads, railways, or other infrastructure leading to and from these cities that need to cross the river.

3. Resources and amenities: One side of the river may have certain resources, amenities, or facilities that people on the other side need access to. This could include hospitals, schools, government offices, or recreational areas.

4. Social and familial connections: People may have friends, family, or other social connections on the opposite side of the river. They may need to cross the river to visit loved ones, attend social events, or maintain relationships.

5. Geographic barriers: In some cases, the river itself may present a geographic barrier that necessitates crossing, even if there's only one city on each side. This could be due to the river being wide, deep, or having strong currents that make crossing difficult without bridges or ferries