'—There doth she ken the awful form
Of Raven-crag—black as a storm—
Glimmering through the twilight pale;
And Ghimmer-crag, his tall twin brother,
Each peering forth to meet the other.'

Raven-crag is well known,—H.C. Robinson writes of it in his Diary in 1818, as "the most significant of the crags at a spot where there is not one insignificant,"—a rock on the western side of Thirlmere, where the Greta issues from the lake. But there is no rock in the district now called by the name of Ghimmer-crag, or the crag of the Ewe-lamb. I am inclined to think that Wordsworth referred to the "Fisher-crag" of the Ordnance Survey and the Guide Books. No other rock round Thirlmere can with any accuracy be called the "tall twin brother" of Raven-crag: certainly not Great How, nor any spur of High Seat or Bleaberry Fell. Fisher-crag resembles Raven-crag, as seen from Thirlmere Bridge, or from the high road above it; and it is somewhat remarkable that Green—in his Guide to the Lakes (a volume which the poet possessed)—makes use of the same expression as that which Wordsworth adopts regarding these two crags, Raven and Fisher.

"The margin of the lake on the Dalehead side has its charms of wood and water; and Fischer Crag, twin brother to Raven Crag, is no bad object, when taken near the island called Buck's Holm"

(A Description of Sixty Studies from Nature, by William Green of Ambleside, 1810, p. 57). I cannot find any topographical allusion to a Ghimmer-crag in contemporary local writers. Clarke, in his Survey of the Lakes, does not mention it.
The Castle Rock, in the Vale of Legberthwaite, between High Fell and Great How, is the fairy castle of Sir Walter Scott's 'Bridal of Triermain'. "Nathdale Fell" is the ridge between Naddle Vale (Nathdale Vale) and that of St. John, now known as High Rigg. The old Hall of Threlkeld has long been in a state of ruinous dilapidation, the only habitable part of it having been for many years converted into a farmhouse. The remaining local allusions in The Waggoner are obvious enough: Castrigg is the shortened form of Castlerigg, the ridge between Naddle Valley and Keswick.
In the "Reminiscences" of Wordsworth, which the Hon. Mr. Justice Coleridge wrote for the late Bishop of Lincoln, in 1850, there is the following reference to The Waggoner. (See Memoirs, vol. ii. p. 310.)

"The Waggoner seems a very favourite poem of his. He said his object in it had not been understood. It was a play of the fancy on a domestic incident, and lowly character. He wished by the opening descriptive lines to put his reader into the state of mind in which he wished it to be read. If he failed in doing that, he wished him to lay it down. He pointed out with the same view, the glowing lines on the state of exultation in which Ben and his companions are under the influence of liquor. Then he read the sickening languor of the morning walk, contrasted with the glorious uprising of Nature, and the songs of the birds. Here he has added about six most exquisite lines."

The lines referred to are doubtless the eight (p. 101), beginning

'Say more; for by that power a vein,'

which were added in the edition of 1836.
The following is Sara Coleridge's criticism of The Waggoner. (See Biographia Literaria, vol. ii. pp. 183, 184, edition 1847.)

"Due honour is done to 'Peter Bell', at this time, by students of poetry in general; but some, even of Mr. Wordsworth's greatest admirers, do not quite satisfy me in their admiration of 'The Waggoner', a poem which my dear uncle, Mr. Southey, preferred even to the former. 'Ich will meine Denkungs Art hierin niemandem aufdringen', as Lessing says: I will force my way of thinking on nobody, but take the liberty, for my own gratification, to express it. The sketches of hill and valley in this poem have a lightness, and spirit—an Allegro touch—distinguishing them from the grave and elevated splendour which characterises Mr. Wordsworth's representations of Nature in general, and from the passive tenderness of those in 'The White Doe', while it harmonises well with the human interest of the piece; indeed it is the harmonious sweetness of the composition which is most dwelt upon by its special admirers. In its course it describes, with bold brief touches, the striking mountain tract from Grasmere to Keswick; it commences with an evening storm among the mountains, presents a lively interior of a country inn during midnight, and concludes after bringing us in sight of St. John's Vale and the Vale of Keswick seen by day-break—'Skiddaw touched with rosy light,' and the prospect from Nathdale Fell 'hoar with the frost-like dews of dawn:' thus giving a beautiful and well-contrasted Panorama, produced by the most delicate and masterly strokes of the pencil. Well may Mr. Ruskin, a fine observer and eloquent describer of various classes of natural appearances, speak of Mr. Wordsworth as the great poetic landscape painter of the age. But Mr. Ruskin has found how seldom the great landscape painters are powerful in expressing human passions and affections on canvas, or even successful in the introduction of human figures into their foregrounds; whereas in the poetic paintings of Mr. Wordsworth the landscape is always subordinate to a higher interest; certainly, in 'The Waggoner', the little sketch of human nature which occupies, as it were, the front of that encircling background, the picture of Benjamin and his temptations, his humble friends and the mute companions of his way, has a character of its own, combining with sportiveness a homely pathos, which must ever be delightful to some of those who are thoroughly conversant with the spirit of Mr. Wordsworth's poetry. It may be compared with the ale-house scene in 'Tam o'Shanter', parts of Voss's Luise, or Ovid's Baucis and Philemon; though it differs from each of them as much as they differ from each other. The Epilogue carries on the feeling of the piece very beautifully."

The editor of Southey's Life and Correspondence—his son, the Rev. Charles Cuthbert Southey—tells us, in a note to a letter from S.T. Coleridge to his father, that the Waggoner's name was Jackson; and that "all the circumstances of the poem are accurately correct." This Jackson, after retiring from active work as waggoner, became the tenant of Greta Hall, where first Coleridge, and afterwards Southey lived. The Hall was divided into two houses, one of which Jackson occupied, and the other of which he let to Coleridge, who speaks thus of him in the letter to Southey, dated Greta Hall, Keswick, April 13, 1801: