The Burren:
The Burren is an amazing place. It is a karst limestone region of approximately 300 sq km which lies in the North West corner of Co Clare, in Ireland. It is composed of limestone pavements, which are eroded in a distinctive pattern known as karren. This pavement is crisscrossed by cracks known as grykes and underneath the pavement there are huge caves and rivers that suddenly flood when it rains. It contains dozens of megalithic tombs and Celtic crosses and a ruined Cistercian Abbey from the 12th century, Corcomroe. You can find villages abandoned since famine times and green roads on which you can walk for miles without ever seeing a car.
The Cliffs of Moher :
Cliffs of Moher are located at the south-western edge of The Burren area near Doolin. The cliffs rise 120 m above the Atlantic Ocean at Hag's Head and extend for a distance of eight kilometers and to a height of 214 m.
The Cliffs are a significant tourist attraction, and there is a visitor center and parking lot on the site managed by Shannon Heritage, which also operates O'Brien's Tower.
A largely unenclosed walking trail runs along the top edge of the entire length of the cliffs, skirting private grazing lands and often running within mere meters of a sheer drop off into the ocean.