Coolyslin () is a townland to the south of the town of Castlefin in County Donegal, Ireland. It is within the electoral division of Urney West. It is also a part of the hamlet of Cusheen and the parish of Urney and Castlefin. Coolyslin, which is approximately in area, lies on the L3044 between Ringsend and Doneyloop.
Nearby amenities Castlefinn Bridge (1760), located at Mullanboy, Ringsend, Castlefin, is around half a mile from Coolyslin.
Saint Columba's Church (1860) in Doneyloop, Castlefin, is around two miles from Coolyslin.
Sub-townlands Coolyslin is bordered by several other townlands and is composed of two sub-townlands. +Coolyslin subtownlandsSubtownlandPlaceRoadCoolyslin UpperTo the southR235Coolyslin LowerTo the northL3044
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