Park Drive Reservation Ravine in Rosedale derives its name from the closed road allowance called Park Drive Reservation. (Closed to public motor vehicles since April 1973.) This road was used to access the network of roads in the Don valley prior to construction of the Don Valley Parkway and the extension to Bayview Ave. 

In this ravine, Yellow Creek is apparently seen in an open manmade channel, but this is really part of the Spadina Storm Trunk Sewer and carries water piped from Castle Frank Brook. Yellow Creek is buried underground.

Some botany:

NATURE POETRY

Rueful hemlocks, gaunt and old, with boughs a-droop, despairing,
Clutch for touch of mother-earth; the while the pine is daring
To rock the stars amid its cones and lull them with its croon,
And snare the silver eagle that is nested in the moon.   – Katharine Lee Bates (1859-1929)

Miles Hearn