You can walk or cycle along the canal through east London all the way to the Thames (3 hr). The St. Pancras lock is directly north of St Pancras station. Regent's Canal was once a lifeline for trade and industry in London with narrowboats and barges ferrying goods to and from North London. The canal winds its way from the Grand Union Canal near Paddington in West London, past Regent's Park, Camden, Islington and Mile End to Limehouse, where it meets the Thames. From Camden Lock you can walk upstream along the canal to Regent's Park and on to London Zoo. It is a great way to approach the Zoo and a good way to avoid the traffic. Downstream of Camden is less pretty but still an interesting walk, taking you through the Islington Tunnel (one of the longest tunnels in the British canal system) and out in to East London. Whichever way you go along the path, watch out for cyclists!