The crane is tidal for a short distance before its confluence with the Thames.
British Dictionary definitions for Thames
(tɛmz). a river in S England, rising in the Cotswolds in several headstreams and flowing generally east through London to the North Sea by a large estuary. Length: 346 km (215 miles) Ancient name Tamesis (ˈtæməsɪs)
(teɪmz; θeɪmz). a river in SE Canada, in Ontario, flowing south to London, then southwest to Lake St Clair. Length: 217 km (135 miles)