Booger for cake on table (bigeyedphish) wrote in thequestionclub,
Booger for cake on table
bigeyedphish
thequestionclub

When people travel rivers (or, I guess land too) that are not mapped, how can they tell how far they have gone? I'm talking about in maybe the 1700s or earlier. How would they know to write in their journal that they traveled 18 miles up the river, for example?
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