A copy of Bartlett’s 1602 map of Ulster, showing the Rhone river
or as it was known then Roe Owen, the Rhone today flows from Eglish on the Derryfubble road, and if you use openstreetmap and trace the map back from here where it’s last called the Rhone to here towards Killymaddy(Knox). It flows from there to the Blackwater just at the Argory.
one can only assume that the Rhone would have been in it’s day, a quite useful river to get from the Blackwater to Eglish and beyond to the royal ringfort of Sessiamagaroll. The Rhone would have changed dramatically, over the years with various drainage schemes, banks being raised to reclaim land, and the lowering of Lough Neagh, which would have turned it from a broad river, to what you see now.The map also shows what was called then ‘Kile mana’ (Killyman) and ‘Tulloch og rath’ (Tullyhogue fort), the inauguration site of the O’Neill’s.