Situated in the Juan de Fuca strait, Sombrio is susceptible to strong ocean currents that flow from North to South, creating longshore drift. Sombrios cobble beach also experiences beach drift, and with these combined effects create steep berms in the swash zone.
Photo received November 12th, 2015 from: https://www.crd.bc.ca/education/our-environment/ecosystems/coastal-marine/intertidal-zone
Being a leading edge rocky shoreline, sombrio is subject to vertical zonation which can be seen with the distinct brown algal, red algal, and subtidal zones. Sombrios backshore consists of a Douglas Fir, Coastal Western Hemlock forest with a rich understory of salal, oregon grape, deer fern and huckleberries (What is the intertidal zone? 2015).
Sombrio experiences diurnal tides, in October seeing changes of almost 10 ft.
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