The confluence of the Trent with the Humber takes place near Alkborough, "where Dr. Stukeley places the _Aquis_ of Ravennas, having discovered a Roman _castrum_ and a vicinal road. The Roman castle is square, 300 feet each side, the entrance north, the west side is objected to the steep cliff hanging over the Trent, which here falls into the Humber; for this castle is very conveniently placed in the north-west angle of Lincolnshire, as a watch-tower over all Nottingham and Yorkshire, which it surveys. I am told the camp is now called _Countess Close_, and they say a Countess of Warwick lived there, perhaps owned the estate; but there are no marks of building, nor, I believe, ever were. The vallum and ditch were very perfect. Before the north entrance is a square plot, called the Green, where I suppose the Roman soldiers lay _pro castris_. In it is a round walk, formed into a labyrinth, which they call 'Julian's Bower.'" So, where Trent and Ouse unite to form the broad and "storming Humber," that "keeps the Scythian's name," our survey ends; the rivers have now become an estuary, and that, as another writer will presently show, soon begins to open out towards the sea, along which the vessels come and go to "merchandising Hull" and other ports which during this century have risen into notice. T. G. BONNEY. [Illustration: BOLTON BRIDGE.] THE HUMBER AND ITS TRIBUTARIES. CHAPTER VI. THE WHARFE. General Characteristics--The Skirfare--Langstrothdale--Kettlewell--Dowkabottom Cave--Coniston and its Neighbourhood--Rylstone and the Nortons--Burnsall--Appletreewick: an Eccentric Parson--Simon's Seat--Barden Tower and the Cliffords--The "Strid"--Bolton Abbey and Bolton Hall--The Bridge--Ilkley--Denton and the Fairfaxes--Farnley Hall and Turner--Otley--Harewood--Towton Field--Kirkby Wharfe--Bolton Percy.