Question: How many acres is the park that Waltham Town Lock is located in?
Sentence (from "Lee Valley Park"): Lee Valley Regional Park is a 10000 acre 26 mi long linear park, much of it green spaces, running through the northeast of Greater London, Essex and Hertfordshire from the River Thames to Ware, through areas such as Stratford, Clapton, Tottenham, Enfield, Walthamstow, Cheshunt, Broxbourne and Hoddesdon in an area generally known as the Lea Valley.
Relevant evidence: Yes