The west side of Vashon, along Colvos Passage, is less exposed to waves than the eastern side of the island and as a result there has been much less redistribution of sediment - less erosion, less opportunity for spit development, less consolidation of littoral cells. The nearshore platform is narrower and the irregular shoreline is divided into many small littoral cells -- short stretches of bluffs eroding and feeding sediment into small coves or to a few small spits and cuspate forelands.
Lisabuela is located on one of these small barriers - although the original morphology is a little confusing and most of the historic wetland is now lawn. The spit appears to have been fed by sediment eroded from the bluffs to the north - which remain a nice example of what natural shorelines tend to look like in this heavily forested part of the world.
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