No. The Ring of Kerry (Iveragh Peninsula, County Kerry, Ireland) borders only the Atlantic Ocean—on its western and southern coasts.
Ireland is an island; the Irish Sea lies to the east (Dublin side), separated by the entire island. No part of Kerry reaches it.
179 km (111 mi) circular route from Killarney: Killorglin → Glenbeigh → Cahersiveen → Waterville → Sneem → Kenmare → Killarney. Coastal cliffs, beaches, stone forts, subtropical gardens (Gulf Stream effect).