Colin says: As the tide recedes - rivulets can be seen cutting across the sands in a north-westerly direction towards duddon estuary as water seeps back into the sea. These "runnels" are permanent geological features, and still exist at high tide even though they are then under water. It is the extensive ridge and runnel beach north of Earnse Point, (running into the Duddon Estuary inter-tidal sandbanks), which provides the sand source for the northern dunes.
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