Puerto Rico Highway 6685 (PR-6685) is a rural highway in Puerto Rico that runs south to north, connecting the towns of Ciales and Manatí on Puerto Rico's north coast.

[2] It runs slightly parallel to Puerto Rico Highway 149 until it ends at Puerto Rico Highway 2 in Manatí.

[3] It has a junction with PR-149 in Ciales and with Puerto Rico Highway 642 in Río Arriba Saliente barrio, in Manatí.

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