Route 236 - Sustrans.org.ukRoute 236 is an 18.8-mile route on the National Cycle Network, connecting Cosham to Portchester and Southampton to Lyndhurst.routeShare this page This route is on the National Cycle Network. This route runs traffic-free between Cosham and Portchester. It then restarts in Southampton City Centre where there are ferry links to the Isle of Wight and Hythe. There is access to Southampton's https://www.sustrans.org.uk/find-a-route-on-the-national-cycle-network/route-236/