Sin: කළුතර kaḷutara – Tam: களுத்துறை kaḷuttuṟai
‘Black River Crossing’ WP, Sri Lanka
From Sin: kalu-ganga, ‘black or dark river’; and tara, ‘raft, crossing’.
The modern crossing is the 38m Kalutara Bridge which links the Western regions to the South, as the crossing here has always done.

View of Kalutara Chaithya from the Bridge Travel Kalutara