The T2 series consists of six disks, “The Continents”, and this is number 4:
(Image: © Copyright Gregory Williams (Flickr) and licensed for reuse under Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0))
The obvious feature here is a monkey, but that doesn’t help, because monkeys can be found in more than one continent. However, this also looks very like the famous monkey depicted using lines drawn in the ground at Nazca, in Peru, South America.
In the box is the letter “T”. We’ve seen an “R” already in disk 5, so this is shaping up to be a word of the form “___TR_”.
At the bottom is the familiar CH→ mark of the artist Charlie Harrow.