The Channel Tunnel ("Chunnel") connects Folkestone, Kent (UK) with Coquelles, Pas-de-Calais (near Calais, France). There is no Chunnel station in Paris.
Eurostar trains use the Gare du Nord—one of Paris's six major mainline termini, located in the 10th arrondissement. This has been the Paris terminus since Eurostar began in 1994.
"Chunnel" refers only to the 50.5 km undersea tunnel section. The high-speed lines on either side (LGV Nord in France, HS1 in UK) connect to major city stations. Paris's Gare du Nord is ~290 km from the tunnel portal—a 1h20m ride at 300 km/h.