Pont 21 : Lower Glen Almond; Strathearn
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There are two separate
maps of parts of Perthshire on this sheet, separated by a faint ink line.
They are known as Pont 21(1) and Pont 21(2). Pont 21(1) shows the River
Almond from a point just west of Perth (not shown) in the east to the
Sma' Glen (not named on the map), west of Butthendy (Buchanty)
in the west - a distance of about 15km. South of the river, the map extends
to Cluthy (Clathy). Pont 21(2) includes the drainage basin of the
River Earn from its headwaters west of Loch Eryn (Loch Earn) in
the west to a point just east of Duply Cast.[le] (Dupplin Castle)
near Aberdalgie, south west of the town of Perth (not shown) in the east.
The northern margin encloses Binchoynie Hill (Ben Chonzie, a 3,048ft
hill) and the area around Loch Turret. Along the southern margin can be
seen Blackford, south west of modern Auchterarder, and the Water of May
around Path of Condie in the south east.