River Wandle
With a total length of about , the river passes through the London boroughs of Croydon , Sutton , Merton and Wandsworth , where it reaches the Thames . 
<triplet> Croydon <subj> London boroughs <obj> instance of <triplet> Sutton <subj> London boroughs <obj> instance of <triplet> Merton <subj> London boroughs <obj> instance of <triplet> Wandsworth <subj> London boroughs <obj> instance of