MacFarlane, Robert “The Old Ways” (Viking 2012)

The second thing to know about sea roads is that they are not arbitrary. There are optimal routes to sail across open sea, as there are optimal routes to walk across open land. Sea roads are determined by the shape of the coastline (they bend to avoid headlands, they dip towards significant ports, archipelagos and skerry guards) as well as by marine phenomena. Surface currents, tidal streams and prevailing winds all offer limits and opportunities for sea travel between certain places (89)


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