Picture the geography first, because it explains everything. Enoshima is a small island, about 4 kilometers, or roughly 2.5 miles, in circumference. It sits right where the Katase River empties into Sagami Bay, a part of the great Pacific Ocean. Rivers, sea and a compact island make a landscape that has drawn people for a very long time. Today you do not need a boat to reach it. A bridge 389 meters long, which is about 1,276 feet, links the island to the Katase district of Fujisawa on the mainland. That is a walk of a few minutes over open water, with the island ahead of you and the bay on both sides. That short span matters. It turns a sea-bound island into a place you can step onto almost casually, and it helps explain why Enoshima has long been both a destination and a day out for the people of the surrounding coast.