County Meath High King of Ireland. It formed from the eastern part of the former Kingdom of Mide (see Kings of Mide) but now forms part of the province of Leinster. Historically, the kingdom and its successor territory the Lordship of Meath, included all of counties Meath, Fingal and Westmeath as well as parts of counties Cavan, Longford, Louth, Offaly and Kildare. The seat of the High King of Ireland was at Tara. The archaeological complex of "Brú na Bóinne" is 5,000 years old, and includes the burial sites of Newgrange, Knowth and Dowth, in the north-east of the county. It is
County Cavan springs near Bailieborough; the River Annalee which flows from Lough Sillan and joins the Erne; and the Cladagh river which rises from Cuilcagh and flows into Fermanagh. The Glyde and the Owenroe also source in Cavan. Cavan is known as 'The Lakeland County' and is reputed to contain 365 lakes. At , Lough Sheelin is the county's largest lake; it is situated in the south of the county and forms a three way border on its waters between counties Meath, Westmeath and Cavan. A large complex of lakes form in the north and west of Cavan into designated Specially Protected