Which city of Pakistan once known as “City of Maple Trees”?

Which city of Pakistan once known as “City of Maple Trees”?

پاکستان کا کون سا شہر کبھی "میپل کے درختوں کا شہر" کہلاتا تھا؟
Explanation

Pakistan has large forests of maple trees in Abbottabad, Hunza, Gilgit, Skardu, Swat, Dir and Chitral areas.