Clew Bay

Clew Bay, a natural ocean bay in County Mayo, contains Ireland’s most extensive display of sunken drumlins. Drumlins are elongated, teardrop-shaped hills formed by moving glacier ice, and sunken drumlins are those now partially underwater. The islands of Clew Bay—approximately 360 altogether—date back at least 20,000 years, when much of Ireland was covered by an ice sheet.

53.412910°, -8.243890°

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