Meath's landscape was shaped during the Last Glacial Period, which ended 11,700 years ago. The soils of the county are mostly derived from glacial till, consisting of a mix of clay, sand and gravel which were deposited by glacial melt-water. In the north of the county near the border with Cavan, a small series of drumlins were formed from boulder clay. Loughs typically form in between the poorly-drained inter-drumlin areas, however unlike in neighbouring Cavan and Westmeath, Meath has no sizable loughs, other than Lough Sheelin, on which the county shares a small coastline in its westernmost tip.